Port Adelaide Football Club is a professional Australian rules football club based in Alberton, South Australia. The club's senior men's team plays in the Australian Football League (AFL), where they are nicknamed the Power, while its reserves men's team competes in the South Australian National Football League (SANFL), where they are nicknamed the Magpies. Since its founding, the club has won an unequalled 36 SANFL premierships and 4 Championship of Australia titles, in addition to an AFL Premiership in 2004. It has also fielded a women's team in the AFL Women's (AFLW) league since 2022 (S7).

Founded in 1870, Port Adelaide is the oldest professional football club in South Australia. Port Adelaide was a founding member of the South Australian Football Association, later renamed as the SANFL. Port Adelaide has repeatedly asserted itself as a dominant force within South Australian football, going undefeated in all competitions in 1914, and enjoying sustained periods of success under coaches Fos Williams and John Cahill, sharing a combined 19 premierships between them. The club's sustained success in the SANFL eventually led it being granted a licence to compete in the AFL from 1997, becoming the second South Australian based side in the competition after the Adelaide Football Club in 1991. It its time in the AFL, the club has claimed four minor premierships and one premiership.

Port Adelaide holds a unique status among AFL clubs, being the only pre-existing non-Victorian club to have entered the AFL from another league. It has an intense rivalry with intra-city opponents Adelaide; the two compete in twice-yearly fixture known as the Showdown, while historically it enjoyed a long-standing rivalry with fellow SANFL club Norwood. It has played home games in the SANFL, at both senior and reserves level, at its club headquarters of Alberton Oval, since 1880, and the venue is also used for home games in the AFLW and occasional pre-season fixtures in the AFL. In the national competition the club has played home games at Adelaide Oval since the venue's redevelopment concluded in 2014.

Port Adelaide first adopted the colours of black and white in 1902, in a design commonly known as the 'prison bars' guernsey, which is still worn to this day in the SANFL. Upon entering the AFL in 1997, the colours of teal and silver were added to the club palette and the Power nickname was adopted, to enable differentiation from the Collingwood Football Club, who also wore black and white and were nicknamed the Magpies.

Port Adelaide was formed on 12 May 1870 as a joint football and cricket club, created by locals to benefit the growing number of workers associated with the surrounding wharves and industries of Port Adelaide. The first training session of the newly formed club took place two days later. The Port Adelaide Football Club played its first match against a newly established club from North Adelaide called the Young Australian. Prior to 1877, football in South Australia was yet to be formally organised by a single body and as a result there were two main sets of rules in use across the state. In an effort to create a common set of rules, Port Adelaide was invited to join seven other clubs in the formation of the South Australian Football Association (SAFA), the first ever governing body of Australian rules football.

In 1879, the club played reigning Victorian Football Association (VFA) premiers Geelong at Adelaide Oval in what was Port Adelaide's first game against an interstate club. It played its first match outside of South Australia two years later, when it travelled to Victoria to contest a game against the Sale Football Club.

The club won its first premiership in 1884, when it ended Norwood's run of six consecutive premierships. It later contested the SAFA's first grand final in 1889, as Port Adelaide and Norwood had finished the season with equal minor round records. Norwood went on to defeat Port Adelaide by two goals. Port Adelaide won its second SAFA premiership the following year, and went on to be crowned "Champions of Australia" for the first time after defeating VFA premiers South Melbourne.

1890 Championship of Australia	Score
Port Adelaide	7
South Melbourne	6
Venue: Adelaide Oval

As the 1890s continued, Australia was affected by a severe depression that forced many players to move interstate to find work. This exodus translated into poor on-field results for the club. By 1896, the club was in crisis and finished last, causing the club's committee to meet with the aim of revitalising the club. The revitalisation had immediate results, helping Port Adelaide win a third premiership in 1897, one of only four occurrences since 1877 where a team won a premiership after finishing last the previous year. Stan Malin won Port Adelaide's first Magarey Medal in 1899.

During the 19th century, the club had nicknames including the Cockledivers, the Seaside Men, the Seasiders and the Magentas. In 1900, Port finished bottom in the six-team competition, which it has not done in any senior league until 2024.

Port Adelaide began wearing black and white guernseys in 1902 after it was having trouble finding dyes that would last for its blue and magenta guernseys. After finishing the 1902 season on top of the ladder, Port Adelaide was disqualified from their finals game against South Adelaide after the club disputed the use of an unaccredited umpire. The 1902 SAFA premiership was subsequently awarded to North Adelaide after they defeated South Adelaide in the Grand Final a week later. Port Adelaide offered to play North Adelaide after the conclusion of the season, but the SAFA refused to allow it. Port Adelaide won the premiership the following year.

1914 Championship of Australia	G	B	Total
Port Adelaide	9	16	70
Carlton	5	6	36
Venue: Adelaide Oval

In the early 1910s, Port Adelaide became a consistent premiership contender, setting up the club to win three more Championships of Australia. Port Adelaide won the South Australian Football League (SAFL) premiership in 1910 defeating Sturt 8.12 (60) to 5.11 (41) in the Grand Final. The club would go on to defeat Collingwood for the 1910 Championship of Australia title, and Western Australian Football League (WAFL) premiers East Fremantle in an exhibition match. They also defeated a combination of some of the WAFL's best players in another match. Although Port Adelaide had success in the minor rounds the following two seasons, dropping only one game in 1911 and going undefeated in 1912, it was knocked out of contention by West Adelaide both times. The club won the SAFL premiership in 1913, dropping only two games during the minor round and defeating North Adelaide in the Grand Final. They also defeated Fitzroy for the 1913 Championship of Australia.

Port Adelaide v South Australia	G	B	Total
South Australia	5	10	40
Port Adelaide	14	14	98
Venue: Jubilee Oval

The 1914 Port Adelaide Football Club season is unique in SANFL history, being the only occasion in which a team has gone undefeated. The club won all its pre-season matches, won all fourteen SAFL games and the 1914 SAFL Grand Final where it held North Adelaide to a single goal for the match 13.15 (93) to 1.8 (14). It also became the first to score over 1000 points during the minor round. The club met Victorian Football League (VFL) premiers Carlton in the Championship of Australia, defeating them by 34 points to claim a record fourth title. At the end of the 1914 season, a combined team from the six other SAFL clubs played Port Adelaide and lost to the subsequently-dubbed "Invincibles" by 58 points.

Port Adelaide's early-century success was hindered by World War I. During the war, the club lost three players as casualties. A scaled-back competition referred to as the 'Patriotic League' was organised during wartime in which Port Adelaide won the 1916 and 1917 instalments. Port Adelaide initially struggled to replicate its past success after the war. After eventually winning the 1921 premiership under the captaincy of Harold Oliver, many of Port Adelaide's champion players from before the war started to retire, and the club's performance declined. It won only a single premiership between 1922 and 1935.

By the mid-1930s, Port Adelaide's form began to recover. It suffered two narrow grand final losses in 1934 and 1935, before winning consecutive premierships the following two years. During 1939, Bob Quinn, in his third year as a player for the club, coached the team to a Grand Final win over West Torrens. Many Port Adelaide players also enlisted for military service during this time. The club suffered six player casualties during the war.

1939 SANFL Grand Final Last Grand Final before War	G	B	Total
Port Adelaide	16	28	124
West Torrens	11	11	77
Venue: Adelaide Oval	crowd: 44,885

Just as had happened in 1914, the league was hit hard by player losses in World War II. Due to a lack of able men, the league's eight teams were reduced to four and Port Adelaide temporarily merged with nearby West Torrens from 1942 to 1944. The joint club played in all three Grand Finals during this period, winning the 1942 instalment, but losing the 1943 and 1944 editions to the Norwood-North Adelaide combination. While normal competition resumed in 1945, Port Adelaide was unable to regain its pre-war success in the rest of the decade. In particular, it lost the 1945 SANFL Grand Final after a remarkable comeback from West Torrens. The 'All Australian', predecessor to the modern 'All-Australian' team, was created by Sporting Life magazine in 1947, with Bob Quinn being named in the side as captain.

During the 1950s, Port Adelaide reestablished itself as a perennial contender, winning seven premierships. At the end of the 1949, having missed two finals series in a row, the Port Adelaide Football Club's committee sought out a coach that could win the club its next premiership. Following a failed attempt to obtain Jim Deane, the decision was made to appoint Fos Williams, a rover from West Adelaide. In his second season as player-coach in 1951, Williams led the club to their first standalone premiership in 12 seasons, defeating North Adelaide by 11 points. In the 1951 post-season, Port Adelaide lost an exhibition match to reigning VFL premiers Geelong.

1955 Exhibition Match	G	B	Total
Port Adelaide	9	10	64
Melbourne	9	11	65
Venue: Norwood Oval	Crowd: 16,400

In the mid-1950s, Port Adelaide and Melbourne, often the premiers of South Australian and Victorian leagues respectively, played exhibition matches at Norwood Oval. The most notable game was the 1955 match, which had an estimated crowd of 23,000. The match went down to the last 15 seconds when Frank Adams kicked a decisive behind to give Melbourne a one-point victory.

Geof Motley took over the captain-coaching role at the club in 1959 when Williams retired from his playing career and also took a break from coaching. That year, the club won the premiership and equalled a national record of six consecutive Grand Final victories, having won each premiership from 1954 to 1959. Port Adelaide's premiership streak was brought to an end in the 1960 preliminary final with a 27-point loss to Norwood.

1965 SANFL Grand Final Fos Williams's ninth premiership.	G	B	Total
Port Adelaide	12	8	80
Sturt	12	5	77
Venue: Adelaide Oval	Crowd: 62,543

Williams returned in 1962, and coached Port Adelaide to win three of the next four premierships. In 1965 he coached his ninth and last premiership in front of 62,543 people, the largest-ever crowd at Adelaide Oval. After the 1965 Grand Final, Port Adelaide's success was limited by the dominance of Sturt, which won seven premierships over this period under the leadership of Jack Oatey. Despite playing in 6 of the next 10 grand finals, Port Adelaide failed to win another premiership in that span.

1977 SANFL Grand Final	G	B	Total
Port Adelaide	17	11	113
Glenelg	16	9	105
Venue: Football Park	Crowd: 56,717

One of Port Adelaide's leading players during the Fos Williams era was John Cahill. After retiring from playing in 1973 and following the departure of Fos Williams to West Adelaide in 1974, he took over as coach and began another era of premiership success for the club. In 1976, Cahill took Port Adelaide to its first Grand Final under his leadership, facing Sturt. Sturt won in front of an official attendance of 66,897, the record for football in South Australia. The actual crowd was estimated at 80,000, much bigger than the official figure. The following year, Port Adelaide won the premiership to break a 12-year drought.

The 1980 season was Port Adelaide's most dominant since 1914. The club completed its fourth ever 'Triple Crown', winning the premiership, Magarey Medal and having the SANFL's leading goalkicker in a single season. The Magarey Medal was awarded to Russell Ebert for a record 4th time and Tim Evans set the then-league goal kicking record of 146 goals in a season. The club set a new record for most points scored during a season at 3,176, whilst also having conceding only 1,687 points. The club's win–loss record was 19–2 with one draw and a percentage of 165.31, its best percentage since 1914.

Following the 1982 season, Cahill was offered a contract by Collingwood to coach their club in the VFL. In his stead, Russell Ebert became coach in 1983. During his five years as coach, Port Adelaide made the finals three times, and achieved a win rate of above 55%. John Cahill returned as coach from the 1988 season, winning the premiership that year. He won a further five premierships, totalling a record-equalling ten over his coaching career.

Two key events of the late 1980s were attempts by the VFL to further expand outside of Victoria and financial difficulties in the SANFL. In 1989, seven of the ten SANFL clubs were recording losses and the combined income of the SANFL and WAFL had dropped to 40% of that of the VFL. During May 1990, the SANFL clubs unanimously accepted a SANFL proposal to not enter a club from South Australia until 1993. Weeks later, Port Adelaide, suffering from a mixture of ambition and frustration, started secret negotiations with the VFL in the town of Quorn for entry to the competition in 1991. When knowledge of Port Adelaide's negotiations to gain an AFL licence were made public, the other nine SANFL clubs called a crisis meeting to discuss options. Plans were made to kick Port Adelaide out of the SANFL should they succeed, and to prevent them from using Football Park as a home ground. SANFL clubs urged Justice Olssen to make an injunction against the bid, which he agreed to. During these meetings, an option was discussed to make a counter offer to the AFL. On the 16th of August, the SANFL officially launched a submission for a composite team. After legal action from all parties, the AFL agreed to accept the SANFL's bid to enter the composite team, which was named the Adelaide Football Club.

"These twenty blokes, everyone whose helped us, are sensational people and all the views that you have read in the press the one thing that really matters is that there will always be a Port Adelaide Football Club."

— George Fiacchi upon accepting the 1990 Jack Oatey Medal for best on ground at the 1990 SANFL Grand Final

During December 1994, Max Basher announced that Port Adelaide had won the tender for the second South Australian AFL licence on the condition that a merger take place between two existing AFL clubs to keep the league at the club limit imposed by the AFL in 1993. As such, the licence would not be made available until at least 1996, and was not guaranteed. With the merger of the Brisbane Bears and Fitzroy looming, the club was advised on 21 May 1996 by the AFL that they would take part in the 1997 AFL season.

1997 West End Showdown I	G	B	Total
Adelaide Crows	11	6	72
Port Adelaide	11	17	83
Venue: Football Park	Crowd: 47,265

Following confirmation of their entry in 1997, the club began preparations to enter the league. John Cahill began the transition to the AFL, with Stephen Williams, a son of Fos Williams, taking over the SANFL coaching position from midway through the 1996 season. Cahill then set about forming a group which would form the inaugural squad. Brownlow Medallist and 1990 Port Adelaide premiership player, Gavin Wanganeen, was signed from Essendon and made captain of a team made up of six existing Port Adelaide players, two from the Adelaide Crows, seven players from other SANFL clubs and 14 recruits from interstate. The AFL's father–son rule for the club was set at 200 games for SANFL players before 1997, compared to only 100 for Victorian clubs. On 29 March 1997, Port Adelaide played its first AFL premiership match against Collingwood at the MCG, suffering a 79-point defeat. It won its first AFL game in round 3 against Geelong, and defeated cross-town rivals and eventual premiers Adelaide by 11 points in the first Showdown in round 4. The club finished its first season 9th, missing the finals on percentage behind Brisbane. Following the 1998 season, John Cahill retired from his coaching position.

In 1999, Mark Williams, another son of Fos Williams, took over as coach of Port Adelaide and led the club to many notable first achievements in the AFL over the next decade. They earned a spot in the AFL finals for the first time in Williams' first season. They were eliminated by the season's eventual premier, North Melbourne, by 44 points in their qualifying final. Port Adelaide had a very successful 2001 season, starting with a maiden pre-season competition victory. Port Adelaide finished their 2001 home-and-away season in third place, though the club would lose both finals it contested. In 2002, Port Adelaide built on its success and won its first AFL minor premiership. However, they lost to the eventual premiers, the Brisbane Lions, in the preliminary final. Port Adelaide continued its home-and-away dominance in 2003 and again claimed the minor premiership; however, like the previous year, Port Adelaide was eliminated in the preliminary final, which led to certain elements of the press calling Port Adelaide "chokers" as well as trucking magnate Allan Scott in early 2004—who was the founder and owner of Scott's Transport, Port Adelaide's major sponsor—publicly calling for Williams' dismissal.

The 2004 season started strongly for Port Adelaide, winning five of their first six matches. Although they lost three of their next five games, the club would only lose a single game between Round 12 and the end of the home-and-away season. This resulted in the club claiming the minor premiership for third consecutive year. Port Adelaide won its qualifying final against Geelong, earning a home preliminary final. Port Adelaide made it through to its first AFL grand final after defeating St Kilda in a preliminary final by six points, with Gavin Wanganeen kicking the winning goal. The following week, Port Adelaide faced the Brisbane Lions in the 2004 AFL Grand Final, who were attempting to win a record-equalling fourth straight AFL premiership. Port Adelaide led by 15 points at quarter time, but a strong second quarter by Brisbane meant only one point separated the sides at half time. Late in the third quarter, Port Adelaide took the ascendency to lead by 17 points at three-quarter time, and dominated the final term to win by 40 points: 17.11 (113) to 10.13 (73). Byron Pickett was awarded with the Norm Smith Medal for being judged the best player in the match, tallying 20 disposals and kicking three goals. Upon helping win Port Adelaide's first AFL premiership and earning the Jock McHale Medal as the coach of the premiership-winning side, an exuberant Williams took to the field after the siren and ripped off his tie in a mock choking gesture, later exclaiming during his acceptance speech: "Allan Scott, you were wrong!"

2004 AFL Grand Final	G	B	Total
Port Adelaide	17	11	113
Brisbane Lions	10	13	73
Venue: Melbourne Cricket Ground	Crowd: 77,671

"Port Adelaide are the winningest team in Australia. The ol' Port Adelaide have won 36 premierships, today, at the MCG, may just be their finest hour."

— Tim Lane's statement at the conclusion of the 2004 AFL Grand Final

Port Adelaide had limited success in the middle of the decade. In 2005, the club made the finals for the fifth consecutive season, where they contested the only Showdown final to date, with rivals Adelaide winning by 83 points. In 2007, Port Adelaide finished the minor round second on the ladder with 15–7 record. They reached that year's grand final, where they were defeated by Geelong by an AFL record margin of 119 points, 24.19 (163) to 6.8 (44).

Following their second grand final, Port Adelaide began experiencing financial troubles and also saw a decline in performance. By 2009, the club had accumulated a consolidated debt totalling $5.1 million and was unable to pay its players; they had lost $1.6 million the season before. The AFL delayed giving the club financial support, instead urging it to sort out deals with SANFL as a predecessor to any league support. On 20 May, Port were handed $2.5 million in debt relief by the SANFL, and on 15 June were handed a $1 million grant by the AFL commission. Plans for a re-merging of the two teams was rejected by the SANFL early during 2010, though they eventually signed off on the proposal during November 2010.

"He (Demetriou) said he could not imagine an AFL competition without Port Adelaide in it. I thought that was a really strong statement of leadership."

— Keith Thomas at a press conference upon the retirement of Andrew Demetriou

The 2010 season saw Mark Williams step down as senior coach. Matthew Primus took over as caretaker coach for Port Adelaide after Mark Williams stood down. He led the club to five wins from its final seven games.

On 9 September 2010, Matthew Primus was appointed as the senior coach of the club for the next three years. The SANFL sought to take control of Port Adelaide in 2011. Despite underwriting $5 million of Port's debt in 2010, the takeover failed when the SANFL was unable to get a line of credit to cover Port Adelaide's future debts. After the failure of the takeover, AFL Chief executive Andrew Demetriou offered $9 million over the next three years to help the club, ahead of the move to the Adelaide Oval. Port Adelaide suffered its worst season result in 141 years, finishing sixteenth with 3 wins for the season. Rounds 20 and 21 saw the club lose to Collingwood and Hawthorn by record margins of 138 and 165 respectively. The following season, Matthew Primus stepped down from his position as coach, following a loss to Greater Western Sydney.

On 8 October 2012, Ken Hinkley was announced as the new senior coach of the club. During the same week, David Koch was named chairman of the club and numerous board members were replaced. The club finished the home and away season 7th on the ladder, qualifying for finals for the first time since 2007. Port travelled to Melbourne to play Collingwood at the MCG in an Elimination Final where they won by 24 points; they then lost to Geelong by 16 points the following week in a Semi-final.

The 2014 season saw both Port Adelaide and Adelaide move their home ground from Football Park to the redeveloped Adelaide Oval. Port Adelaide signed up a record 48,968 members for the 2014 season, an increase of 23% from the previous year, and averaged 44,824 at home games. Port Adelaide finished fifth on the ladder, with a win–loss record of 14–8. They hosted Richmond in the elimination finals, kicking the first seven goals of the game and leading by as much as 87 points before recording a 57-point victory. After defeating Fremantle in the semi-finals, the club's season ended with a three-point loss to Hawthorn in the preliminary finals.

In 2017, Port Adelaide made finals after winning 14 games to finish fifth on the ladder. Port Adelaide's season came to an end in an elimination final loss to West Coast by 2 points in extra time. In the 2020 AFL season, Port Adelaide qualified for the finals as minor premiers for the first time since 2004, making it to the preliminary final and being defeated by eventual premiers Richmond by 6 points. Port Adelaide returned to the AFL finals in the 2021 season, finishing in second place at the end of the home-and-away season and qualifying for a second consecutive preliminary final, where they were defeated by the Western Bulldogs by 71 points. Despite this, Ollie Wines became the first Port Adelaide player to win the Brownlow Medal, the league's highest individual honour, winning the award with a record-equalling tally of votes. The side then suffered a slump in form, losing the first five games of the 2022 season and failing to qualify for the finals. Senior coach Ken Hinkley, whose contract was set to expire at the end of the 2023 season, was extended for a further two seasons in August 2023, at a time when Port returned to the top four and qualified for the finals, though were eliminated in straight sets at the hands of the Brisbane Lions and Greater Western Sydney. Despite further pressure on the coach following a heavy mid-season loss, Port had a winning finish to the regular season to close in second position. In the finals, they were defeated by more than 80 points by Geelong in a home qualifying final, then narrowly defeated Hawthorn in the semi-final and finally were well beaten by minor premiers Sydney at the SCG, slumping the club to a 6-9 finals win-loss record in Hinkley's tenure, which included four consecutive preliminary final defeats (2014, 2020, 2021 and 2024). Hinkley broke the club record for most AFL games coached in the preliminary final loss, eclipsing Mark Williams' record of 273 games.

Port Adelaide supported the local Port Adelaide Women's Football Club (nicknamed the Magpies and wearing the "Prison Bar" guernsey) who had been playing in the Adelaide Amateur Football League since 2003. Port Adelaide first showed interest in an AFL Women's side in 2015. The club signed Erin Phillips as their marquee player in the event that the club was admitted to the AFLW for the 2017 season. However, logistical demands related to the club's China program prevented the club from submitting a bid. The club subsequently attempted to enter a side in the SANFL Women's League (SANFLW), but this approach was rejected by the South Australian Football Commission. In 2018 The Port Adelaide Women's Club in the amateur league was wound up. In May 2021, the AFL Commission announced that the remaining four clubs without AFLW teams would be admitted to the competition by the end of 2023, with the clubs to bid for entry order. Port Adelaide's bid to enter the competition was successful, with the AFL Commission deciding all four clubs would debut in the AFLW in 2022 season 7.

As part of Port Adelaide's initial bid for the 1994 AFL licence, the club had no plans to maintain a presence in the SANFL. After winning the tender for the licence, however, an agreement was created with the SANFL for Port Adelaide to field two separate clubs in the SANFL and AFL, at the request of the other SANFL clubs. This agreement resulted in the creation of the Port Adelaide Magpies Football Club, a separate legal entity to Port Adelaide Football Club. For the first few years after 1997, the Port Adelaide Magpies were forced to train at Ethelton to ensure they would not gain any advantage using the upgraded Alberton training facilities. Additionally, Port Adelaide AFL-listed players who were not selected for the senior team were randomly drafted to SANFL clubs to play reserves matches until the two Port Adelaide entities merged. This arrangement was necessitated as the other SANFL clubs did not want the reserves side to gain any use of the senior side in the AFL's resources, fearing any potential advantages would be too strong in the SANFL. Australian football historian John Devaney described the forced separation of Port Adelaide's SANFL and AFL operations as being "akin to the enforced splitting up of families associated with military conquest or warfare".

In response to financial trouble suffered by both Port Adelaide entities, the "One Port Adelaide Football Club" movement was launched by former players Tim Ginever and George Fiacchi on 20 August 2010, in an effort to merge Port Adelaide's AFL and SANFL operations. A website was created that claimed 50,000 signatures were needed for the merger. On 16 November 2010, following approval from all nine SANFL clubs, the club formalised the off-field merger between the two entities. On 10 September 2013, Port Adelaide and the SANFL agreed to a model to allow all its AFL-listed players (not selected to play for Port Adelaide in the AFL) to play for the SANFL side. As part of the arrangement, the club lost its recruiting zones and could no longer field sides in the junior SANFL competitions, and as a result established an 18–22-year-old academy training team to compete in the league's reserves competition. In 2018, Port Adelaide and the league jointly agreed that it would no longer field a team in the SANFL Reserves competition.

Port Adelaide initially still had success in the SANFL after accession into the AFL, with the Port Adelaide Magpies winning back-to-back Grand Finals in 1998 and 1999. However, the club would not make another grand final until the 2014 season, where it was defeated by Norwood by four points. Port Adelaide featured in two further grand finals against Sturt and Glenelg, though it would be defeated in both.

The club did not field a team in the SANFL in the 2020 season due to AFL restrictions imposed during the COVID-19 pandemic, though it re-joined the competition in 2021. Lower-table and mid-table finishes occurred over the next few years. In December 2023, the Herald Sun reported that the club had applied for entry into the Victorian Football League (VFL) or a national reserves competition in 2025, thereby transitioning its reserves team out of the SANFL. The application occurred after Port Adelaide chairperson David Koch lamented the "different rules to the other SANFL clubs which makes success difficult and frankly, has a detrimental impact on the development of our AFL players". By the end of 2024 the club and SANFL negotiated and approved changes to player recruiting rules for both AFL clubs fielding reserve teams in the competition, ensuring Port Adelaide's continued presence in the SANFL.

The tradition dictating that the captain of the Port Adelaide Football Club wear the number one guernsey started when Clifford Keal wore the number as club captain for the first time in 1924. The tradition was cemented, at least in the view of then-secretary Charles Hayter, when in 1929 he received a letter from a junior Kilkenny player requesting a number one Port Adelaide guernsey as he had just become captain of his underage team. Hayter granted the wish of the junior and provided him with a number one Port Adelaide guernsey. Since 1924, there have been few exceptions to the tradition. The most notable exception was Geof Motley, who followed the captaincy of Fos Williams. Following his appointment as captain-coach, Motley elected to continue wearing the number 17, and continued to do so for the remainder of his career. When Motley handed the captaincy to John Cahill in 1967, at the insistence of coach Fos Williams, the tradition of Port Adelaide captains wearing the number one guernsey resumed. When co-captains were appointed for the 2019 season the No. 1 guernsey was temporarily retired. It was re-instated the following season when the club returned to appointing a single captain.

The white number panel on the back of the Port Adelaide guernsey originates from the first decade of the twentieth century when club secretary James Hodge took the club across Australia to play matches against interstate teams. During the early 1900s, it was commonplace that touring teams would wear numbers, allowing spectators to identify unknown footballers. Port Adelaide attached a white square to the back of its guernsey, with black numbers to be printed on the square. This design would continue to be used after the introduction of numbers into the SANFL, and was interchangeably with a black square and white numbers. The design bearing the black square eventually became the design of choice until 1928. The club introduced a 'permanent' white panel for the 1928 season, which would remain until the club was forced to merge with West Torrens during WWII. The club reintroduced the panel in 1953 and has since continuously used it in the SANFL. The panel was also present on the club's AFL guernsey until it was phased out in 2009. The number panel returned to the club's guernsey in 2017. The white panel is also intended to resemble the white back of a local Magpie species that is present on the badge of South Australia.

Historically, the black-and-white 'Prison Bar' guernsey, alternatively and historically known as the Wharf Pylon guernsey, has been Port Adelaide's most iconic guernsey design. The club first adopted the guernsey in the 1902 season, after having difficulty finding magenta and blue dyes that could repeatedly last the rigours of an Australian rules football match. The guernsey was designed to be a literal depiction of the wharves and pylons that were prominent along the docks of Port Adelaide at the turn of the 20th century. Prior to adopting the guernsey the club had won 3 premierships over 31 years. After adopting the guernsey, the club won 33 premierships and 3 Championships of Australia.

"Anyone that put on the guernsey acted like the guernsey intended it to act. It wasn't built around the player wearing the guernsey. It was the guernsey using a player."

— Retired Port Adelaide player and coach Fos Williams explaining the mythology of the guernsey in 1981

The Prison Bar nickname first originated from fans of rival football clubs, in particular those of Norwood. The nickname was used in a derogatory fashion, in an attempt to liken the club to a criminal stereotype. The nickname first appeared in media in early 1993, in a match report written by former cricketer Alan Shiell. The nickname was subsequently accepted by the Port Adelaide fanbase, becoming a popular nickname for the design among fans.

Upon joining the AFL, Port Adelaide, along with being required to find a new logo, song and nickname, was also forced to replace the Prison Bar guernsey because existing club Collingwood, already using the Magpie logo and nickname, also wore a similar guernsey with vertical black and white stripes. A new guernsey was ultimately created, incorporating teal into its design.

Since the club's entry to the AFL, Port Adelaide has made numerous requests to the AFL to wear the Prison Bar guernsey in specific games, only some of which have been approved. The club was first granted the right to wear an AFL-approved Prison Bar guernsey (a replica of the 1914 premiership design) in the Heritage Round of the 2003 season. During 2007, following controversy the year prior in which the AFL declined Port Adelaide the right to wear their heritage guernsey, the AFL and Port Adelaide reached an agreement whereby the club could wear its traditional guernsey in the heritage round, with the proviso that in future seasons its players can only wear it in home heritage round games and provided that such a game is not against Collingwood. No heritage rounds have been held since this agreement was reached. In 2014, the AFL declined Port Adelaide permission to wear its traditional guernsey for celebrating of 100 years since its 1914 Championship of Australia. On 2 September 2014, the AFL cleared the club to use the guernsey in their final against Richmond, following controversy about their prior decision to have Port Adelaide wear their clash strip. For their 150th anniversary, the club was granted permission to wear the guernsey in its Showdown match in the 2020 season. The following year, Port Adelaide requested permission to permanently wear the guernsey in all future Showdown matches, but this proposal was rejected by the AFL.

Support for the guernsey remains extremely high, with the merchandise for a single game against Carlton in 2013 generating over $500,000. On 9 September 2020, it was revealed that memorabilia associated with the Prison Bar guernsey raised $2,000,000 for the club in 2020, and the Prison Bar guernsey itself was the highest-selling piece of merchandise in the AFL that year. Towards the end of 2018, a group of supporters organised to push for the return of the club's traditional guernsey full time from the start of the 2020 AFL season, to coincide with the club's 150th anniversary year, and a supporter petition in 2019 calling for the reinstatement of the guernsey reached 10,000 signatures. On 29 July 2021, club president David Koch revealed that, if the club wore the Prison Bar guernsey without permission, it would be deducted four premiership points along with a fine. The club negotiated an agreement with Collingwood to return the guernsey for the 2023 home Showdown match; an agreement which has since been extended to include all future home showdown matches. The club's AFL Women's team wore the guernsey in its home showdown match against Adelaide in Round 1 of the 2024 season.

Uniform evolution
Design	Period	Description and history	Statistics
	1870–1876	The recorded colours worn by the club. This guernsey was revived in 2005, during the Heritage Round.	Seasons: 7 – Premierships: 0
	1877–1883	Original full magenta uniform.	Seasons: 9 – Premierships: 0
	1884–1892	Better dyes resulted in magenta appearing closer to red. Blue bib added to top of uniform.	Seasons: 9 – Premierships: 2 (1884, 1890)
	1893–1901	Magenta and blue stripes with leather lace divider. In 2004, the team wore a heritage uniform honoring this guernsey during the Heritage Round.	Seasons: 9 – Premierships: 1 (1897)
	1902–present	'Prison Bar' uniform. Worn for all South Australian premierships since 1902 except for 1951. Used once in each of the 2003, 2007, 2013, 2014, 2020 AFL seasons, and in every home showdown since the 2023 AFL season and 2024 AFLW season.	Seasons: 101 – Premierships: 34 (1903, 1906, 1910, 1913, 1914, 1916*, 1917*, 1921, 1928, 1936, 1937, 1939, 1954, 1955, 1956, 1957, 1958, 1959, 1962, 1963, 1965, 1977, 1979, 1980, 1981, 1988, 1989, 1990, 1992, 1994, 1995, 1996, 1998, 1999)
	1951	A one-off uniform used in the Jubilee year of Australia, given to the club by Collingwood.	Seasons: 1 – Premierships: 1 (1951)
	1997–2009	Inaugural uniform in the AFL. Port Adelaide was required to incorporate teal and remove vertical stripes by the AFL to appease Collingwood.	Seasons: 13 – Premierships: 1 (2004)
	2010–present	Permanently used in the AFL since 2010.	Seasons: 11 – Premierships: 0