The Iron Giant is a 1999 American animated science fiction film produced by Warner Bros. Feature Animation and distributed by Warner Bros. It is based on the 1968 novel The Iron Man by Ted Hughes (which was published in the United States as The Iron Giant). The film is directed by Brad Bird (in his directorial debut) and produced by Allison Abbate and Des McAnuff, from a screenplay written by Tim McCanlies, and based on a story treatment by Bird. The film stars the voices of Jennifer Aniston, Harry Connick Jr., Vin Diesel, James Gammon, Cloris Leachman, John Mahoney, Eli Marienthal, Christopher McDonald, and M. Emmet Walsh. Set during the Cold War in 1957, the film centers on a young boy named Hogarth Hughes, who discovers and befriends a giant alien robot. With the help of a beatnik artist named Dean McCoppin, Hogarth attempts to prevent the U.S. military and Kent Mansley, a paranoid federal agent, from finding and destroying the Giant.

The film's development began in 1994 as a musical with the involvement of the Who's Pete Townshend, though the project took root once Bird signed on as director and hired McCanlies to write the screenplay in 1996. The film was animated using traditional animation, with computer-generated imagery used to animate the Iron Giant and other effects. The understaffed crew of the film completed it with half of the time and budget of other animated features. Michael Kamen composed the film's score, which was performed by the Czech Philharmonic. It was the final film by Warner Bros. Feature Animation to be fully animated and not a live-action/animation hybrid.

The Iron Giant premiered at Mann's Chinese Theater in Los Angeles on July 31, 1999, and was released in the United States on August 6. The film significantly underperformed at the box office, grossing $31.3 million worldwide against a production budget of $50 million, which was attributed to Warner Bros.' lack of marketing and skepticism towards animated film production following the box office failure of Quest for Camelot in the preceding year. Despite this, the film was praised for its story, animation, musical score, characters, the portrayal of the title character and the voice performances of Aniston, Connick, Diesel, Mahoney, Marienthal, and McDonald. The film was nominated for several awards, winning nine Annie Awards out of 15 nominations. Through home video releases and television syndication, the film gathered a cult following and is widely regarded as a modern animated classic, and one of the greatest animated films ever made. In 2015, an extended, remastered version of the film was re-released theatrically, and on home video the following year.

In October 1957, during the Cold War, an object from space crashes in the ocean just off the coast of Maine and then enters the forest near the town of Rockwell.

The following night, nine-year-old Hogarth Hughes investigates and finds the object, a 50-foot-tall alien robot; he runs away but then returns to save the robot when he gets electrocuted while trying to eat the transmission lines of an electrical substation. Hogarth eventually befriends the Giant, finding him docile and curious. When he eats railroad tracks in the path of an oncoming train, the train collides with him and derails; Hogarth leads the Giant away from the area, discovering that he can self-repair. While there, Hogarth shows the Giant comic books and compares him to the hero Superman.

The incidents lead paranoid U.S. government agent Kent Mansley to Rockwell. He suspects Hogarth's involvement after talking with him and his widowed mother, Annie, and rents a room in their house to keep an eye on him. Hogarth evades Mansley and leads the Giant to a junkyard owned by beatnik artist Dean McCoppin, who reluctantly agrees to keep him. Hogarth enjoys his time with the Giant but is compelled to explain the concept of death to the Giant after he witnesses hunters killing a deer.

Hogarth is detained and interrogated by Mansley when he discovers evidence of the Giant after finding a photo of him next to Hogarth and summons a U.S. Army contingent led by General Shannon Rogard to the scrapyard to prove the Giant's existence, but Dean (having been warned by Hogarth earlier) tricks them by pretending that the Giant is one of his art pieces. Later, while playing with a toy gun, Hogarth inadvertently activates the Giant's defensive system, firing a laser beam in the process. Dean yells at him for nearly killing Hogarth, and the saddened Giant runs away with Hogarth giving chase. Dean realizes that the Giant was only acting in self-defense and catches up to Hogarth as they follow the Giant.

The Giant rescues two boys falling from a roof when he arrives, winning over the townspeople. Mansley spots the Giant in the town while leaving Rockwell and has the Army attack the Giant after he has picked up Hogarth, forcing the two to flee. They initially evade the military by using the Giant's flight system, but the Giant is shot down and crashes to the ground.

Hogarth is knocked unconscious, but the Giant assumes that Hogarth is dead, and in a fit of rage and grief transforms into a war machine and returns to Rockwell. Mansley convinces Rogard to prepare a nuclear missile launch from the USS Nautilus, as conventional weapons prove to be ineffective. Hogarth awakens and returns in time to calm the Giant while Dean clarifies the situation to Rogard.

Rogard is ready to stand down and order the Nautilus to deactivate its primed nuke, but a panicked Mansley snatches Rogard's radio and orders the missile launch. The missile is targeted to hit Rockwell, where it will destroy the town upon impact in the resulting nuclear detonation. Mansley attempts to escape, but the Giant intervenes, and Rogard has Mansley arrested. To save the town, the Giant bids farewell to Hogarth and flies off to intercept the missile. As he soars into the missile's path, the Giant remembers Hogarth's words, "You are who you choose to be," smiles contentedly, and declares himself "Superman" as he collides with the weapon. The missile explodes in the atmosphere, saving Rockwell, its population, and the military forces nearby, while the Giant is presumably destroyed, leaving Hogarth, Dean, Annie, and Rogard devastated.

Months later, Dean and Annie, now a couple, have a chat at a memorial of the Giant made by Dean, standing in Rockwell. Hogarth is given a package from Rogard containing a screw from the Giant, which is the only remnant found. That night, Hogarth finds the screw trying to move on its own and, remembering the Giant's ability to self-repair, happily allows the screw to leave.

The screw joins many other parts as they converge on the Giant's head on the Langjökull glacier in Iceland, and the Giant smiles as he begins reassembling himself.

• Eli Marienthal as Hogarth Hughes, an intelligent, curious, energetic, and courageous 9-year-old boy with an active imagination. Marienthal's performances were videotaped and given to animators to work with, which helped develop expressions and acting for the character. He is named after author Ted Hughes, who wrote the book that inspired the film, and artist Burne Hogarth.
• Jennifer Aniston as Annie Hughes, Hogarth's mother, the widow of a military pilot, and a diner waitress. According to Bird, Aniston was the only casting suggestion made by Warner Bros. execs that he personally really liked and approved.
• Harry Connick Jr. as Dean McCoppin, a beatnik artist and junkyard owner. Bird felt it appropriate to make the character a member of the Beat Generation, as they were viewed as mildly threatening to small-town values during that time. An outsider himself, he is among the first to recognize the Giant as no threat.
• Vin Diesel as the Iron Giant, a 50 ft., metal-eating robot. Of unknown origin and created for an unknown purpose, the Giant involuntarily reacts defensively if he recognizes anything as a weapon, immediately attempting to destroy it. The Giant's voice was originally going to be electronically modulated but the filmmakers decided they "needed a deep, resonant and expressive voice to start with", so they hired Diesel.
• James Gammon as Foreman Marv Loach, a power station employee who follows the robot's trail after it destroys the station.
  • Gammon also voices Floyd Turbeaux, a farmer and friend of Earl Stutz.
• Cloris Leachman as Karen Tensedge, Hogarth's fourth grade teacher at Redford Elementary School.
• Christopher McDonald as Kent Mansley, a paranoid federal government agent sent to investigate sightings of the Iron Giant. The logo on his official government car says he is from the "Bureau of Unexplained Phenomena".
• John Mahoney as General Shannon Rogard, an experienced and level-headed military leader in Washington, D.C., Mansley's superior at the Bureau of Unexplained Phenomena who goes from merely being annoyed and exasperated with Mansley to openly despising him.
• M. Emmet Walsh as Earl Stutz, a sailor and the first man to see the Giant.

In addition, Ollie Johnston and Frank Thomas voice the train's engineers briefly seen near the start of the film. Johnston and Thomas, who were animators and members of Disney's Nine Old Men, were cited by Bird as inspirations for his career, which he honored by incorporating their voices, likenesses, and first names into the film.

The origins of the film lie in the book The Iron Man (1968), by poet Ted Hughes, who wrote the novel for his children to comfort them in the wake of their mother Sylvia Plath's suicide. In the 1980s, rock musician Pete Townshend chose to adapt the book for a concept album; it was released as The Iron Man: A Musical in 1989. In 1991, Richard Bazley, who later became the film's lead animator, pitched a version of The Iron Man to Don Bluth while working at his studio in Ireland. He created a story outline and character designs but Bluth passed on the project. After a stage musical was mounted in London, Des McAnuff, who had adapted Tommy with Townshend for the stage, believed that The Iron Man could translate to the screen, and the project was ultimately acquired by Warner Bros. Entertainment.

In late 1996, while developing the project on its way through, the studio saw the film as a perfect vehicle for Brad Bird, who at the time was working for Turner Feature Animation developing Ray Gunn. Turner Broadcasting had recently merged with Warner Bros. parent company Time Warner, and Bird was allowed to transfer to the Warner Bros. Animation studio to direct The Iron Giant. After reading the original Iron Man book by Hughes, Bird was impressed with the mythology of the story and in addition, was given an unusual amount of creative control by Warner Bros. This creative control involved introducing two new characters not present in the original book, Dean and Kent, setting the film in America, and discarding Townshend's musical ambitions (who did not care either way, reportedly remarking, "Well, whatever, I got paid"). Bird would expand upon his desire to set the film in America in the 1950s in a later interview:

The Maine setting looks Norman Rockwell idyllic on the outside, but inside everything is just about to boil over; everyone was scared of the bomb, the Russians, Sputnik — even rock and roll. This clenched Ward Cleaver smile masking fear (which is really what the Kent character was all about). It was the perfect environment to drop a 50-foot-tall robot into.

Ted Hughes, the original story's author, died before the film's release. His daughter, Frieda Hughes, saw the finished film on his behalf and loved it. Townshend, who stayed on as the film's executive producer, enjoyed the final film as well.

Tim McCanlies was hired to write the script, though Bird was somewhat displeased with having another writer on board, as he wanted to write the screenplay himself. He later changed his mind after reading McCanlies' then-unproduced screenplay for Secondhand Lions. In Bird's original story treatment, America and the USSR were at war at the end, with the Giant dying. McCanlies decided to have a brief scene displaying his survival, stating, "You can't kill E.T. and then not bring him back." McCanlies finished the script within two months. McCanlies was given a three-month schedule to complete a script, and it was by way of the film's tight schedule that Warner Bros. "didn't have time to mess with us" as McCanlies said. The question of the Giant's backstory was purposefully ignored as to keep the story focused on his relationship with Hogarth. Bird considered the story difficult to develop due to its combination of unusual elements, such as "paranoid fifties sci-fi movies with the innocence of something like The Yearling". Hughes himself was sent a copy of McCanlies' script and sent a letter back, saying how pleased he was with the version. In the letter, Hughes stated, "I want to tell you how much I like what Brad Bird has done. He's made something all of a piece, with terrific sinister gathering momentum and the ending came to me as a glorious piece of amazement. He's made a terrific dramatic situation out of the way he's developed The Iron Giant. I can't stop thinking about it."

Bird combined his knowledge from his years in television to direct his first feature. He credited his time working on Family Dog as essential to team-building, and his tenure on The Simpsons as an example of working under strict deadlines. He was open to others on his staff to help develop the film; he would often ask crew members their opinions on scenes and change things accordingly. One of his priorities was to emphasize softer, character-based moments, as opposed to more frenetic scenes—something Bird thought was a problem with modern filmmaking. "There has to be activity or sound effects or cuts or music blaring. It's almost as if the audience has the remote and they're going to change channels," he commented at the time. Storyboard artist Teddy Newton played an important role in shaping the film's story. Newton's first assignment on staff involved being asked by Bird to create a film within a film to reflect the "hygiene-type movies that everyone saw when the bomb scare was happening." Newton came to the conclusion that a musical number would be the catchiest alternative, and the "Duck and Cover" sequence came to become one of the crew members' favorites of the film. Nicknamed "The X-Factor" by story department head Jeffery Lynch, the producers gave him artistic freedom on various pieces of the film's script.

The financial failure of Warner's previous animated effort, Quest for Camelot, which made the studio reconsider animated films, helped shape The Iron Giant's production considerably. "Three-quarters" of the animation team on that film helped craft The Iron Giant. By the time it entered production, Warner Bros. informed the staff that there would be a smaller budget as well as time-frame to get the film completed. Although the production was watched closely, Bird commented "They did leave us alone if we kept it in control and showed them we were producing the film responsibly and getting it done on time and doing stuff that was good." Bird regarded the trade-off as having "one-third of the money of a Disney or DreamWorks film, and half of the production schedule" but the payoff as having more creative freedom, describing the film as "fully-made by the animation team; I don't think any other studio can say that to the level that we can." A small part of the team took a weeklong research trip to Maine, where they photographed and videotaped five small cities. They hoped to accurately reflect its culture down to the minutiae; "we shot store fronts, barns, forests, homes, home interiors, diners, every detail we could, including the bark on trees", said production designer Mark Whiting.

Bird stuck to elaborate scene planning, such as detailed animatics, to make sure there were no budgetary concerns. The team initially worked with Macromedia's Director software, before switching to Adobe After Effects full-time. Bird was eager to use the then-nascent software, as it allowed for storyboard to contain indications of camera moves. The software became essential to that team—dubbed "Macro" early on—to help the studio grasp story reels for the film. These also allowed Bird to better understand what the film required from an editing perspective. In the end, he was proud of the way the film was developed, noting that "We could imagine the pace and the unfolding of our film accurately with a relatively small expenditure of resources." The group would gather in a screening room to view completed sequences, with Bird offering suggestions by drawing onto the screen with a marker. Lead animator Bazley suggested this led to a sense of camaraderie among the crew, who were unified in their mission to create a good film. Bird cited his favorite moment of the film's production as occurring in the editing room, when the crew gathered to test a sequence in which the Giant learns what a soul is. "People in the room were spontaneously crying. It was pivotal; there was an undeniable feeling that we were really tapping into something," he recalled.

He opted to give the film's animators portions to animate entirely, rather than the standard process of animating one character, in a throwback to the way Disney's first features were created. The exception were those responsible for creating the Giant himself, who was created using computer-generated imagery due to the difficulty of creating a metal object "in a fluid-like manner". They had additional trouble with using the computer model to express emotion. The Giant consisted of 7000 parts (the Battle Giant had 10,000 parts), and was designed by filmmaker Joe Johnston and refined by production designer Mark Whiting and Steve Markowski, head animator for the Giant. Using software, the team would animate the Giant "on twos" (every other frame, or twelve frames per second) when interacting with other characters, to make it less obvious it was a computer model. Bird brought in students from CalArts to assist in minor animation work due to the film's busy schedule. He made sure to spread out the work on scenes between experienced and younger animators, noting, "You overburden your strongest people and underburden the others [if you let your top talent monopolize the best assignments]." Hiroki Itokazu designed all of the film's CGI props and vehicles, which were created in a variety of software, including Alias Systems Corporation's Maya, Alias' PowerAnimator, a modified version of Pixar's RenderMan, Softimage 3D, Cambridge Animation's Animo (now part of Toon Boom Technologies), Avid Elastic Reality, and Adobe Photoshop.

The art of Norman Rockwell, Edward Hopper and N.C. Wyeth inspired the design. Whiting strove for colors both evocative of the time period in which the film is set and also representative of its emotional tone; for example, Hogarth's room is designed to reflect his "youth and sense of wonder". That was blended with a style reminiscent of 1950s illustration. Animators studied Chuck Jones, Hank Ketcham, Al Hirschfeld and Disney films from that era, such as 101 Dalmatians, for inspiration in the film's animation.

The score for the film was composed and conducted by Michael Kamen, making it the only film directed by Bird not to be scored by his future collaborator, Michael Giacchino. Bird's original temp score, "a collection of Bernard Herrmann cues from '50s and '60s sci-fi films," initially scared Kamen. Believing the sound of the orchestra is important to the feeling of the film, Kamen "decided to comb eastern Europe for an "old-fashioned" sounding orchestra and went to Prague to hear Vladimir Ashkenazy conduct the Czech Philharmonic in Strauss's An Alpine Symphony." Eventually, the Czech Philharmonic was the orchestra used for the film's score, with Bird describing the symphony orchestra as "an amazing collection of musicians". The score for The Iron Giant was recorded in a rather unconventional manner, compared to most films: recorded over one week at the Rudolfinum in Prague, the music was recorded without conventional uses of syncing the music, in a method Kamen described in a 1999 interview as "[being able to] play the music as if it were a piece of classical repertoire." Kamen's score for The Iron Giant won the Annie Award for Music in an Animated Feature Production on November 6, 1999.

Bird opted to produce The Iron Giant in widescreen—specifically the wide 2.39:1 CinemaScope aspect ratio—but was warned against doing so by his advisers. He felt it was appropriate to use the format, as many films from the late 1950s were produced in such widescreen formats. He hoped to include the CinemaScope logo on a poster, partially as a joke, but 20th Century Fox, owner of the trademark, refused.

Bird later recalled that he clashed with executives who wished to add characters, such as a sidekick dog, set the film in the present day, and include a soundtrack of hip hop. This was due to concerns that the film was not merchandisable, to which Bird responded, "If they were interested in telling the story, they should let it be what it wants to be." The film was also initially going to be released under the Warner Bros. Family Entertainment banner, the logo which features mascot Bugs Bunny in a tuxedo eating a carrot as seen in the film's teaser trailer. Bird was against this for a multitude of reasons, mainly because he felt that the logo did not fit the tone of the movie, and eventually got confirmation that executives Bob Daley and Terry Semel agreed. Instead, Bird and his team developed another version of the logo to resemble the classic studio logo in a circle, famously employed in Looney Tunes shorts. He credited executives Lorenzo di Bonaventura and Courtney Vallenti with helping him achieve his vision, noting that they were open to his opinion.

According to a report from the time of its release, The Iron Giant cost $50 million to produce with an additional $30 million going towards marketing, though Box Office Mojo later reported its budget as $70 million. It was regarded as a lower-budget film, in comparison to the films distributed by Walt Disney Pictures.

When he began work on the film, Bird was in the midst of coping with the death of his sister, Susan, who was shot and killed by her estranged husband. In researching its source material, he learned that Hughes wrote The Iron Man as a means of comforting his children after his wife, Sylvia Plath, died by suicide, specifically through the metaphor of the title character being able to re-assemble itself after being damaged. These experiences formed the basis of Bird's pitch to Warner Bros., which was based around the idea "What if a gun had a soul, and didn't want to be a gun?"; the completed film was also dedicated to Hughes and Susan. McCanlies commented that "at a certain point, there are deciding moments when we pick who we want to be. And that plays out for the rest of your life", adding that films can provide viewers with a sense of right and wrong, and expressed a wish that The Iron Giant would "make us feel like we're all part of humanity [which] is something we need to feel." When some critics compared the film to E.T. the Extra-Terrestrial (1982), Bird responded by saying "E.T. doesn't go kicking ass. He doesn't make the Army pay. Certainly you risk having your hip credentials taken away if you want to evoke anything sad or genuinely heartfelt."

The Iron Giant was a commercial failure during its theatrical release; consensus among critics was that its failure was, in part, due to lack of promotion from Warner Bros. This was largely attributable to the reception of Quest for Camelot; after its release, Warner would not give Bird and his team a release date for their film until April 1999. After wildly successful test screenings, the studio was shocked by the response: the test scores were their highest for a film in 15 years, according to Bird. They had neglected to prepare a successful marketing strategy for the film—such as cereal and fast food tie-ins—with little time left before its scheduled release. Bird remembered that the studio produced one teaser poster for the film, which became its eventual poster. Brad Ball, who had been assigned the role of marketing the film, was candid after its release, noting that the studio did not commit to a planned Burger King toy plan. IGN stated that "In a mis-marketing campaign of epic proportions at the hands of Warner Bros., they simply didn't realize what they had on their hands."

The studio needed an $8 million opening to ensure success, but they were unable to properly promote it preceding the release. They nearly delayed the film by several months to better prepare. "They said, 'we should delay it and properly lead up to its release,' and I said 'you guys have had two and a half years to get ready for this,'" recalled Bird. Press outlets took note of its absence of marketing, with some reporting that the studio had spent more money on marketing for the intended summer blockbuster Wild Wild West instead. Warner Bros. scheduled Sunday sneak preview screenings for the film prior to its release, as well as a preview of the film on the online platform Webcastsneak.

After criticism that it mounted an ineffective marketing campaign for its theatrical release, Warner Bros. revamped its advertising strategy for the video release of the film, including tie-ins with Honey Nut Cheerios, AOL and General Motors and secured the backing of three U.S. congressmen (Ed Markey, Mark Foley and Howard Berman). Awareness of the film was increased by its February 2000 release as a pay-per-view title, which also increased traffic to the film's website.

The Iron Giant was released on VHS and DVD on November 23, 1999, with a Laserdisc release following on December 6. Warner Bros. spent $35 million to market the home video release of the film. The VHS edition came in three versions—pan and scan, pan and scan with an affixed Giant toy to the clamshell case, and a widescreen version. All of the initial widescreen home video releases were in 1.85:1, the incorrect aspect ratio for the film. In 2000, television rights to the film were sold to Cartoon Network and TNT for $3 million. Cartoon Network showed the film continuously for 24 consecutive hours in the early 2000s for such holidays as the Fourth of July and Thanksgiving.

The Special Edition DVD was released on November 16, 2004. In 2014, Bird entered discussions with Warner Bros. regarding the possibility of releasing The Iron Giant on Blu-ray. On April 23, he wrote on Twitter that "WB & I have been talking. But they want a bare-bones disc. I want better," and encouraged fans to send tweets to Warner Home Video in favor of a Special Edition Blu-ray of the film. The film was ultimately released on Blu-ray on September 6, 2016, and included both the theatrical and 2015 Signature Edition cuts, as well as a documentary entitled The Giant's Dream that covered the making of the film. This version also received a DVD release months earlier on February 16 with The Giant's Dream documentary removed. This film became available on HBO Max on November 1, 2020.

The Iron Giant received critical acclaim. On Rotten Tomatoes, the film holds a 96% approval rating based on 142 reviews, with an average rating of 8.20/10. The website's critics consensus reads, "The endearing Iron Giant tackles ambitious topics and complex human relationships with a steady hand and beautifully animated direction from Brad Bird." Metacritic, which uses a weighted average, assigned the film a score of 85 out of 100 based on 29 critics, indicating "universal acclaim". Audiences polled by CinemaScore gave the film an average grade of "A" on an A+ to F scale. The Reel Source forecasting service calculated that "96–97%" of audiences that attended recommended the film.

Kenneth Turan of the Los Angeles Times called it "straight-arrow and subversive, [and] made with simplicity as well as sophistication," writing, "it feels like a classic even though it's just out of the box." Roger Ebert of the Chicago Sun-Times gave the film 3.5 out of 4 stars, and compared it, both in story and animation, to the works of Japanese director Hayao Miyazaki: "Like the new Japanese animated films, The Iron Giant is happy to be a 'real movie' in everything but live action. There are no cute little animals and not a single musical number: It's a story, plain and simple... It works as a lot of animation does, to make you forget from time to time that these are moving drawings, because the story and characters are so compelling." He concluded that it was "not just a cute romp but an involving story that has something to say." The New Yorker reviewer Michael Sragow dubbed it a "modern fairy tale", writing, "The movie provides a master class in the use of scale and perspective—and in its power to open up a viewer's heart and mind." Time's Richard Schickel deemed it "a smart live-and-let-live parable, full of glancing, acute observations on all kinds of big subjects—life, death, the military-industrial complex." Lawrence Van Gelder, writing for The New York Times, deemed it a "smooth, skilled example of animated filmmaking." Joe Morgenstern of The Wall Street Journal felt it "beautiful, oh so beautiful, as a work of coherent art", noting, "be assured that the film is, before anything else, deliciously funny and deeply affecting".

Both Hollywood trade publications were positive: David Hunter of The Hollywood Reporter predicted it to be a sleeper hit and called it "outstanding", while Lael Loewenstein of Variety called it "a visually appealing, well-crafted film [...] an unalloyed success." Bruce Fretts of Entertainment Weekly commented, "I have long thought that I was born without the gene that would allow me to be emotionally drawn in by drawings. That is, until I saw The Iron Giant." Peter Stack of the San Francisco Chronicle agreed that the storytelling was far superior to other animated films, and cited the characters as plausible and noted the richness of moral themes. Jeff Millar of the Houston Chronicle agreed with the basic techniques as well, and concluded the voice cast excelled with a great script by Tim McCanlies. The Washington Post's Stephen Hunter, while giving the film 4 out of 5 stars, opined, "The movie — as beautifully drawn, as sleek and engaging as it is — has the annoyance of incredible smugness."

The Iron Giant opened at Mann's Chinese Theater in Los Angeles on July 31, 1999, with a special ceremony preceding the screening in which a concrete slab bearing the title character's footprint was commemorated. The film opened in Los Angeles and New York City on August 4, 1999, with a wider national release occurring on August 6 in the United States. It opened in 2,179 theaters in the U.S., ranking at number nine at the box office accumulating $5.7 million over its opening weekend. It was quick to drop out of the top ten; by its fourth week, it had accumulated only $18.9 million—far under its reported $50 million budget. According to Dave McNary of the Los Angeles Daily News, "Its weekend per-theater average was only $2,631, an average of $145 or perhaps 30 tickets per showing"—leading theater owners to quickly discard the film. At the time, Warner Bros. was shaken by the resignations of executives Bob Daly and Terry Semel, making the failure much worse. T.L. Stanley of Brandweek cited it as an example of how media tie-ins were now essential to guaranteeing a film's success.

The film went on to gross $23.2 million domestically and $8.1 million internationally for a total of $31.3 million worldwide. Analysts deemed it a victim of poor timing and "a severe miscalculation of how to attract an audience." Lorenzo di Bonaventura, president of Warner Bros. at the time, explained, "People always say to me, 'Why don't you make smarter family movies?' The lesson is, Every time you do, you get slaughtered."

The Hugo Awards nominated The Iron Giant for Best Dramatic Presentation, while the Science Fiction and Fantasy Writers of America honored Brad Bird and Tim McCanlies with the Nebula Award nomination. The British Academy of Film and Television Arts gave the film a Children's Award as Best Feature Film. In addition The Iron Giant won nine Annie Awards out of fifteen nominations, winning every category it was nominated for, with another nomination for Best Home Video Release at The Saturn Awards. IGN ranked The Iron Giant as the fifth favorite animated film of all time in a list published in 2010. In 2008, the American Film Institute nominated The Iron Giant for its Top 10 Animated Films list.

Awards

Award	Date of ceremony	Category	Recipients	Result
Annie Awards	November 6, 1999	Best Animated Feature Film	Allison Abbate, Des McAnuff, and John Walker Warner Bros. Pictures; Warner Bros. Feature Animation	Won
		Outstanding Individual Achievement in Effects Animation	Allen Foster
			Michel Gagné	Nominated
		Outstanding Individual Achievement in Character Animation	Jim Van der Keyl
			Steve Markowski	Won
			Dean Wellins	Nominated
		Outstanding Individual Achievement for Directing in an Animated Feature Production	Brad Bird	Won
		Outstanding Individual Achievement for Music in an Animated Feature Production	Michael Kamen
		Outstanding Individual Achievement for Production Design in an Animated Feature Production	Alan Bodner
			Mark Whiting	Nominated
		Outstanding Individual Achievement in Storyboarding in an Animated Feature Production	Mark Andrews	Won
			Kevin O'Brien	Nominated
			Dean Wellins
		Outstanding Individual Achievement for Voice Acting in an Animated Feature Production	Eli Marienthal For playing "Hogarth Hughes".	Won
		Outstanding Individual Achievement for Writing in an Animated Feature Production	Tim McCanlies (screenplay) and Brad Bird (story)
BAFTA Children's Award	November 12, 2000	Best Feature Film	Brad Bird, Allison Abbate, Des McAnuff, and Tim McCanlies
Florida Film Critics Circle	January 9, 2000	Best Animated Film	Brad Bird	Won
Genesis Awards	March 18, 2000	Best Feature Film – Animated
Hugo Award	September 2, 2000	Best Dramatic Presentation	Brad Bird (screen story and directed by), Tim McCanlies (screenplay by), and Ted Hughes (based on the book The Iron Man by)	Nominated
Las Vegas Film Critics Society	January 18, 2000	Best Animated Film		Won
Los Angeles Film Critics Association	January 20, 2000	Best Animated Film	Brad Bird
Motion Picture Sound Editors Awards	March 25, 2000	Best Sound Editing – Animated Feature
		Best Sound Editing – Music – Animation		Nominated
New York Film Critics Circle	January 10, 2000	Best Animated Film		2nd place
Santa Fe Film Critics Circle Awards	January 9, 2000	Best Animated Film		Won
Saturn Awards	June 6, 2000	Best Home Video Release		Nominated
Science Fiction and Fantasy Writers of America	May 20, 2000	Best Script	Brad Bird and Tim McCanlies
Young Artist Awards	March 19, 2000	Best Family Feature Film – Animated
		Best Performance in a Voice-Over (TV or Feature Film) – Young Actor	Eli Marienthal	Won

The film has gathered a cult following since its original release. In 2018, when questioned over social media if there was ever a possibility of a sequel, Bird stated that because the film was considered a financial failure, a sequel was not likely to ever happen, but he also stressed that he considered the story of The Iron Giant to be completely self-contained in the film and saw no need for extending the story.

The Cartoon Network series Mad, did a parody of the movie as well as the film The Iron Lady for their Season 3 premiere entitled The Iron Giant Lady. In the sketch, British prime minister Margaret Thatcher is the Giant and inspires other gynoids to take positions of political power.

In the Season 7 episode of Futurama entitled "Assie Come Home", the Iron Giant's head can be seen in Yuri's chop-shop in Filthytown.

The designers of the 2015 video game Ori and the Blind Forest were guided by inspirations from the film and Disney's The Lion King.

In the Lego Movie spin-off series Unikitty!, the episode entitled "Kaiju Kitty" references the film's climatic moment of the Giant being blown up by the missile.

The Iron Giant appears in Steven Spielberg's 2018 science fiction film Ready Player One. Aech had collected the parts of the Iron Giant, which she later controlled during the Battle of Castle Anorak, where he teams up with Gundam to fight Mechagodzilla. After the Iron Giant sacrifices itself and falls into a pool of lava, it gives a thumbs up to Wade and his crew while it sinks into the lava paying direct homage to the end of Terminator 2: Judgment Day when the T-800 gives the thumbs up to both John & Sarah Connor as it sacrifices itself into the molten steel.

The Iron Giant appears in Malcolm D. Lee's 2021 basketball film Space Jam: A New Legacy. He is among the characters in the Warner Bros. 3000 Entertainment Server-Verse that watches the basketball game between the Tune Squad and the Goon Squad. After the Tune Squad won the game, the Giant shared a fist bump with King Kong.

The Iron Giant appears as a playable character in the fighting game MultiVersus on July 26, 2022, as a part of its "open beta".

The Iron Giant appears in the Teen Titans Go! episode, "Warner Bros. 100th Anniversary". He is among the remains of Blockbuster Island.

Beto Tlahuetl, director of the Mexican music band "Grupo Soñador", stated that he was inspired by the movie to write the song "El Gigante de Hierro" (The Iron Giant) after dreaming of the Giant dancing in Los Angeles streets. The lyrics emphasize the theme of never giving up on a daughter's love by being the biggest protector.

A remastered and extended cut of the film, named the Signature Edition, was shown in one-off screenings across the United States and Canada on September 30, 2015, and October 4, 2015. The edition is approximately two minutes longer than the original cut, and features a brief scene with Annie and Dean in the cafe and the Giant's dream sequence. Both scenes were storyboarded by Bird during the production on the original film, but could not be finished due to time and budget constraints. Before they were fully completed for this new version, they were presented as deleted storyboard sequences on the 2004 DVD bonus features. They were animated in 2015 by Duncan Studio, which employed several animators that worked on the original film, under Bird's supervision. The film's Signature Edition was released on DVD and for digital download on February 16, 2016, with an official Blu-ray release of this cut following on September 6. Along with the additional scenes, it also showcases abandoned ideas that were not initially used due to copyright reasons, specifically a nod to Disney via a Tomorrowland commercial, which was also a reference to his then-recently released film of the same name, and a reference regarding the film being shot with CinemaScope cameras.

On March 14, 2016, coinciding with the release of the Signature Edition, it was announced that The Art of the Iron Giant would be written by Ramin Zahed and published by Insight Editions, featuring concept art and other materials from the film.

• United States in the 1950s
• The Beat Generation

• Hughes, Ted (March 3, 2005). The Iron Man (Paperback). Reprinting of novel on which this film is based. Faber Children's Books. ISBN 0571226124.
• Hughes, Ted; Moser, Barry (August 31, 1995). The Iron Woman (Hardcover). Sequel to The Iron Man. Amazon Remainders Account. ISBN 0803717962.
• James Preller The Iron Giant: A Novelization. Scholastic Paperbacks (August 1999). ISBN 0439086345.

• Official website
• The Iron Giant at IMDb 
• Original theatrical trailer