Arlington Park (formerly known as Arlington International Racecourse) is a former horse race track in the Chicago suburbs of Arlington Heights, Illinois. Once called the Arlington Park Jockey Club, it was located adjacent to the Illinois Route 53 expressway and serviced by the Chicago and Northwestern Railroad.

On February 15, 2023, the Chicago Bears of the National Football League (NFL) completed their purchase of the Arlington Park property. It has been reported that the team may build a stadium on the site for its home games.

Horse racing in the Chicago region had been a popular sport since the early days of the city in the 1830s, and at one time Chicago had more horse racing tracks (six) than any other major metropolitan area.

Arlington International was the site of the first thoroughbred race with a million-dollar purse in 1981. The premier event at Arlington Park was the International Festival of Racing, held in early August, which featured three Grade 1 races on turf: the Arlington Million Stakes, Beverly D. Stakes and Secretariat Stakes.

Owner Churchill Downs Inc. announced plans in February 2021 to sell all 326 acres of Arlington Park property for redevelopment. On September 29, 2021, the Chicago Bears announced that they reached an agreement to purchase the property; the sale was finalized in February 2023.

Arlington International Racecourse was founded as Arlington Park by California businessman Harry D. "Curly" Brown who would later serve as president of Oriental Park Racetrack in Havana, Cuba. The track officially opened in 1927 to 20,000 spectators. Jockey Joe Bollero, who later became a successful trainer, rode Luxembourg to victory in the first race ever run at Arlington.

Benjamin F. Lindheimer acquired control of Arlington Park in 1940 and owned it until his death in 1960. Long involved with the business, adopted daughter Marje Lindheimer Everett then took over management of the racetrack.

Widely respected Hall of Fame trainer Jimmy Jones of Calumet Farms was quoted by Sports Illustrated as saying that Lindheimer "was the savior of Chicago racing" and that "Arlington Park became the finest track in the world—certainly the finest I've ever been on."

On July 5, 1948, Citation won the Stars and Stripes Stakes in his first appearance since winning the Triple Crown, equaling the record of the time by winning in 1:49 1/5. On June 24, 1952, jockey Eddie Arcaro becomes the first American jockey to win 3,000 races.

Five years after the seating capacity increased to 30,000 and parking facilities expanded to accommodate 15,000, a new paddock was unveiled in 1960. In 1964, Arlington Park inherits the thoroughbred race dates of Washington Park, who is now exclusively running harness races.

In 1966, future Hall of Fame jockey Laffit Pincay Jr. got his first American victory. Two years later, the future Hall of Famer Dr. Fager wins the one-mile Washington Park Handicap in world record time of 1:32 1/5 - he carried 134 pounds and held that record until 1998.

In 1968, Marje Everett sold the racetrack to Gulf & Western, remaining as director. The following year, she was accused of bribing Illinois Governor Otto Kerner Jr. The alleged bribes were in the form of stock options in 1961 that Kerner bought at a reduced price and then sold in 1968 at a profit. Kerner was eventually convicted of mail fraud, but Everett denied at trial that she intended to bribe him, and the government never identified her as a briber.

In June 1973, Arlington organized a race for three-year-olds, the Arlington Invitational, to lure Secretariat to the mid-west. Secretariat won easily and Arlington created the Secretariat Stakes, also for three-year-olds but on the turf, in his honor.

In 1981 under the direction of track president Joseph Joyce Jr., Arlington was the home of the world's first million-dollar thoroughbred race: The Arlington Million. The result of that race is noted in bronze at the top of the paddock at Arlington, where a statue of jockey Bill Shoemaker riding John Henry to a come-from-behind victory over 40–1 longshot The Bart celebrates Thoroughbred racing's inaugural million-dollar race.

Arlington entered a new era in 1983 when Richard L. Duchossois led an Illinois investment group to purchase the track from its former owners and made a pledge to continue presenting championship racing; that was tested on July 31, 1985, when a small fire spread quickly out of control and completely destroyed the grandstand and clubhouse. Unsure of the future of Arlington, the meet was moved to Hawthorne Race Course - yet it was announced that the Arlington Million would still be held at Arlington International.

On August 25, 1985, they did just that by using temporary bleachers. Three years after Joyce resigned over disagreements with Duchossois, the track was fully reopened as a new name, Arlington International Racecourse in 1989.

In 1996, 34,000 fans jammed into Arlington to see the two-time Horse of the Year and future Hall of Famer Cigar tie the modern day record of 16 consecutive wins in the Arlington Citation Challenge.

In 2000, reopening after a two-year shutdown caused by contractual disputes preventing racing, Arlington was purchased in September by Churchill Downs Inc. Known as Arlington Park at the time, it hosted hosted the 2002 Breeders' Cup World Thoroughbred Championships at their track.

In 2007 to promote safer racing, Arlington International Racecourse invested $11 million to install a synthetic racing surface called Polytrack which is still used today. Do the Wave won the first race on the Polytrack on May 4. On May 11, Arlington debuts an alternate finish line at the 1/16 pole.

Known as Arlington Park for twelve years, it was renamed Arlington International Racecourse in 2013. In 2016, Arlington debuted the Arlington Racing Club, an ownership group with the goal to garner interest in thoroughbred ownership.

On May 14, 2010, Lee DeWyze, a citizen of Mount Prospect, Illinois, and a contestant on American Idol, performed a concert at Arlington Park for approximately 41,000 fans. Also on May 14, Arlington is featured in an episode of Undercover Boss where Churchill Downs Inc. CEO Bill Carstanjen goes to Arlington and Calder Race Course.

A year later, on May 14, 2011, Haley Reinhart, of Wheeling, Illinois, also made the top 3 on American Idol. She, like DeWyze, had a hometown concert at the track for nearly 30,000 of her own fans and supporters.

Arlington was the first track to install a public-address system and employed the pioneering race caller Clem McCarthy to describe the action. It added the first electric totalizator which allowed a credible tote board and decreased time between races, in 1933. In 1936 it added a photo finish camera. It introduced the first electric starting gate in 1940 and the largest closed-circuit TV system in all of sports in 1967. In 1971, Arlington held the industry's first commercially sponsored race—the $100,000 Pontiac Grand Prix. On July 4, 1976, Arlington hosted the first races on a Sunday in Illinois.

While Arlington is credited in some circles with the introduction of trifecta wagering in 1971, the New York Racing Association first offered the bet a year earlier as "The Triple".

In August 2019, track owner Churchill Downs Inc. (CDI) announced that it would consider options to transfer racing away from Arlington Park after 2021. The announcement stemmed from the enactment of the Illinois Gaming Act, which provided for the legalization of sports betting and the construction of new casinos in Illinois. The law gave CDI the right to install up to 1,200 gaming positions, such as slot machines, at Arlington Park. However, CDI – which had acquired a majority stake of Rivers Casino in nearby Des Plaines earlier that year and had already announced plans to expand it – argued that the installation of gaming positions at Arlington would result in higher tax payments of up to 20% compared to nearby casinos because of contributions needed to fund horse racing purses.

In February 2021, CDI announced plans to sell the entire Arlington Park property for redevelopment. CDI said it would also seek the transfer of Arlington's racing license to another track in the state, but committed to Arlington's race dates for 2021 (April 30 – September 25). In response, the Illinois Thoroughbred Horsemen's Association (which represents thoroughbred owners and trainers at both Arlington and Hawthorne) denounced CDI's decision, alleging that CDI "all but abandoned any meaningful commitment to Illinois racing" after their majority acquisition of Rivers Casino.

In June 2021, the Chicago Bears announced they had submitted a bid to purchase the land for a potential new stadium to replace their longtime home of Soldier Field (where they have played since 1971). Later in June 2021, the Village of Arlington Heights formally approved overlay zoning district for a large-scale football stadium at the site.

The last race was held on September 25, 2021, with a 9-race event. The winner of the final race held at Arlington (which was named "The Luxembourg" after the winner of the first race at the track), was Sister Ruler. The final day was capped off with a showing of a documentary on the fire at the track and a fireworks show.

On September 29, 2021, the Bears announced they would purchase the property for $197.2 million. If a stadium is approved and built, it would be the second horse racing course to be replaced with an NFL venue in recent years, as Inglewood, California's Hollywood Park (once owned by CDI) was replaced by SoFi Stadium, the home of the Los Angeles Chargers and Los Angeles Rams.

On October 27, 2021, the Chicago Bears confirmed that they are not pursuing horse racing but had no further details on their plans for the property. On March 16, 2022, the American football team announced that it have selected MANICA Architecture to help plan the new NFL stadium.

The Bears completed the purchase in February 2023. On May 30, 2023, it started demolition of the interior of the main grandstand, offices, and jockey facilities in preparation for their new stadium. Demolition of the grandstand was completed on September 26, 2023.

On March 11, 2024, Chicago Bears President and CEO Kevin Warren announced that the team had decided to commit $2 billion to build a new stadium in Chicago, leaving the future of the Arlington Park property uncertain. The Bears had run into issues concerning the value of the Arlington Park land, which had been contested by the local school districts in Arlington Heights.

The track had a one-mile and one-eighth dirt oval and a one-mile turf oval. There was stabling on the backstretch for over 2,000 horses.

Arlington replaced its dirt course with a synthetic track prior to the opening of the 2007 season.

• Tony Cobitz (1990–91)
• Caton Bredar (1988–1991)
• Lynne Snierson (1992–1994)
• Christine Gabriel (1995–1997, 2000–2005)
• John G. Dooley (2000–2021)
• Molly Ryan (2006)
• Liane Davis (2006–2007)
• Zoe Cadman (2006–2007)
• Lauren Massarella (2006–2008)
• Joe Kristufek (2006–2018)
• Jessica Pacheco (2008–2013)
• Alyssa Ali (2007–2021)
• Gabby Gaudet (2014–2015)
• Dan Potter (2001–2018)
• Brian Spencer (2015–2017)
• Noel Michaels (2018–2019)

Arlington's live racing season formerly ran from the first Friday in May to the second to last Saturday in September. Since 2001 (up until its final season of 2021) races at Arlington had been announced by John G. Dooley.

The following stakes were held at Arlington in 2019.

Grade I

• Arlington Million
• Beverly D. Stakes
• Secretariat Stakes

Grade III

• American Derby
• American St. Leger Stakes
• Arlington Handicap
• Arlington Classic Stakes
• Arlington Matron Stakes
• Chicago Handicap
• Hanshin Cup Stakes
• Modesty Handicap
• Pucker Up Stakes

Listed

• Addison Cammack Memorial
• Arlington-Washington Futurity Stakes
• Arlington-Washington Lassie Stakes
• Hatoof Stakes
• Isaac Murphy Handicap

Former Races

• American 1000 Guineas Stakes
• Arlington Oaks
• Arlington Sprint Handicap
• Lincoln Heritage Handicap
• Round Table Stakes
• Sea o'Erin Stakes
• Stars and Stripes Turf Handicap
• Washington Park Handicap

• Arlington International website
• Arlington International entertainment

42°5′27.33″N 88°0′36.8″W / 42.0909250°N 88.010222°W / 42.0909250; -88.010222