Airdrieonians

The club was formed in 2002 as Airdrie United, following the bankruptcy of the original Airdrieonians.

Airdrieonians had finished runners-up in the Scottish First Division in the 2001–02 season but went out of business with debts approaching £3 million. The collapse of "The Diamonds", as they were known due to their distinctive kits, created a vacancy in the Scottish Football League (in the Scottish Third Division). Accountant and Airdrieonians fan Jim Ballantyne attempted, with the help of others, to gain entry with a club called "Airdrie United" who were essentially to be a reincarnation of Airdrieonians. Their application however was rejected as the then English Northern Premier League side Gretna were preferred by league members over the new Airdrie United.

Airdrie United then went on to complete a buy-out of the ailing Second Division side Clydebank and with SFL approval the club was relocated to Airdrie, the strips were transformed to resemble that of Airdrieonians, and the name was changed to Airdrie United. While this means that the club is therefore officially a legal continuation of Clydebank, it is almost universally accepted as a reincarnation of Airdrieonians, with a new version of Clydebank being reformed by supporters' groups and entering into the West Region Junior League.

Managed by Sandy Stewart, Airdrie United's first match took place at New Broomfield against Forfar Athletic in August 2002, with captain Stephen Docherty scoring the only goal of the game with Airdrie United winning 1–0. Their debut season saw the club only narrowly fail to achieve promotion by one point due to a late injury-time goal from Brechin City which saw them promoted instead. The club reached the second round of the Challenge Cup, the third round of the Scottish Cup and the third round of the Scottish League Cup having beaten Premier League side Kilmarnock in the second round.

During the rest of Stewart's tenure the club reached the final of the Challenge Cup in 2003 (losing 2–0 to Inverness Caledonian Thistle), and won the Second Division title in 2003–04 season. Having started poorly Airdrie went on a run that saw them unbeaten in the last 18 games of that season, including the final game of the league campaign which saw a crowd of over 5,700 at New Broomfield to watch Airdrie defeat Morton 2–0 and lift the League Championship trophy, the club having been confirmed champions the previous week following their 1–0 victory away to Alloa Athletic at Recreation Park.

In November 2006, Stewart was sacked and replaced by former Airdrieonians player and Airdrie United coach Kenny Black, his first management post.

Under Kenny Black the club suffered four successive play-off defeats:

• In the 2006–07 season as relegation play-off finalists (losing 5–4 on aggregate to Stirling Albion).
• In the 2007–08 season as promotion play-off finalists (losing 3–0 on aggregate to Clyde). However the enforced relegation of Gretna to the Third Division, after being put into administration, prompted a restructuring of the leagues, and Airdrie were promoted to the First Division as the losing play-off finalists.
• In the 2008–09 season as relegation play-off finalists (losing 3–2 on aggregate to Second Division runners up Ayr United). Again Airdrie were given a reprieve as the continued uncertainty over the future of Livingston meant that the West Lothian club were relegated to the Third division, so Airdrie were reinstated to the First Division as losing play-off finalists.
• In the 2009–10 season as relegation play-off semi-finalists (losing 3–1 on aggregate to Brechin City). Unlike the previous two seasons there was no reprieve.

The club won the Challenge Cup in 2008, defeating Ross County 3–2 on penalties after a 2–2 draw, and despite another play-off defeat by 6–2 on aggregate to Dumbarton in the promotion play-off final at the end of 2011–12 season Airdrie were lucky again as the liquidation of the company that operated Scottish Premier League side Rangers and the decision by Scottish Football League clubs that Rangers should play in the Scottish Third Division, meant that an additional team from each tier of Scottish football was promoted for the 2012–13 season. As Airdrie were runners up in the previous season's Second Division promotion play-offs, they were promoted to the Scottish First Division. A season in the First Division came to an end in May 2013, with the club finishing bottom of the league and relegated to Division Two.

In June 2013, the club officially changed its name from Airdrie United Football Club to Airdrieonians Football Club. The name change revived the name of the club it was formed to replace in 2002, following the liquidation of the original Airdrieonians. The Airdrieonians all red club crest was also revived, with an alternate black and red version used for the away kits.

In June 2015 Jim Ballantyne sold control of the club to Tom Wotherspoon, a Lanarkshire businessman and owner of M & H Logistics (who had previously sponsored Hamilton Academical, East Fife and BSC Glasgow). Wotherspoon became chairman and Ballantyne vice-chairman, appointing former Scottish Sun newspaper Head of Sport Iain King as Chief Executive (King left the club in June 2016).

Despite retaining his majority shareholding Tom Wotherspoon resigned as chairman and director of Airdrieonians on 5 June 2017, with former chairman Jim Ballantyne taking Wotherspoon's place as chairman.

In January 2018, it was announced that a consortium of various businessmen (including former Airdrieonians manager Bobby Watson) had taken control of Tom Wotherspoon's controlling shares, bringing to an end a tumultuous period for the club. The majority of the previous board was replaced, including Jim Ballantyne, and subsequently Director of Football Gordon Dalziel (appointed October 2016) departed.

Manager Ian Murray led the club to fifth, third and two second place Scottish League One finishes in 2019, 2020, 2021 and 2022 respectively, with the club missing out on play-off games (due to the COVID-19 pandemic) in 2020, losing to Championship side Morton over a two-legged play-off final in May 2021, and losing to Scottish League One side Queen's Park over a two-legged play-off final in May 2022. After this defeat Murray departed the club for Raith Rovers in the Scottish Championship.

With Rhys McCabe subsequently appointed as player manager, Airdrie finished the 2022–23 season in third place, defeating Falkirk 7–2 on aggregate in the play-off semi-final and Hamilton Academical 6–5 on penalties after extra time in the Championship play-off final at New Douglas Park in May 2023, therefore relegating Hamilton to League One and earning Airdrie a place in the Scottish Championship.

At the beginning of the 2023–24 season, McCabe guided the side to a clean sweep of their group in the Scottish League Cup, gaining 12 points, including defeating top-flight Dundee 1–0, then losing 4–3 after extra time against Premiership side Ross County in the next round. Following a defeat of Premiership side St. Johnstone, Airdrie reached the fifth round of the Scottish Cup for the first time in over 10 years, but lost to Hearts 4–1.

In March 2024, Airdrie reached the final of the Scottish Challenge Cup, and defeated Welsh side The New Saints at Falkirk Stadium 2–1 through goals from Liam McStravick and Nikolay Todorov to lift the trophy for the first time since 2008.

The club finished the league in fourth place and earned a play-off spot. However an aggregate defeat to Partick Thistle over two quarter-final ties saw the club remain in the Championship for another season.