In addition to their first team competing in Scottish League One, Hamilton Academical F.C. also maintain a reserve team competing in the SPFL Reserve League. A reserve team was fielded for many years until the abandonment of the most recent league for those teams in 2009. An under-20 side took part in the SPFL Development League until it was disbanded in 2018.

The club has also maintained a youth academy for younger age groups, with teams playing in competitions such as the Scottish Challenge Cup and the Scottish Youth Cup; as of 2025, that structure is in hiatus as a consequence of a range of issues affecting the wider club.

Academy history 2000s In May 2003, Glasgow businessman Ronnie MacDonald bought a controlling interest in Hamilton Academical for a nominal fee,Ronnie MacDonald resigns as Hamilton chairman after helping Accies recover from cyber fraud sting, Daily Record, 18 December 2018 having previously been at the helm of Maryhill Juniors, then Clyde – a club of comparable stature to Hamilton but competing in the division above. Accies had recently escaped from Scotland's bottom tier after a financial crisis and, having shared grounds with other clubs since 1994, had moved to their new stadium in 2001. With a small fanbase and few other sources of revenue, MacDonald and his associates recognised that his new club's best chances of success would be through engaging with the local community and unearthing players at little cost, primarily through their youth system, with the players then sold on for a profit if their talents outgrew the surroundings. Though practiced to some extent by most clubs, this business model became Hamilton's primary focus from then on; MacDonald soon appointed Allan Maitland, whom he had worked with at Clyde and other clubs at various levels, as head coach and recruited several coaches and other staff directly from his former club, including Les Gray who would play an important role at the club in the coming years.

After quickly gaining promotion to the First Division and consolidating their place under Maitland, in 2005 Hamilton brought in Billy Reid from Clyde to be the next manager, with MacDonald and other staff also previously having worked with him in that club's youth system. Working within a small budget, Reid successfully built a squad mixed with experienced professionals and promising teenagers, and steered them to the top division by winning the 2007–08 Scottish First Division title. The two most prominent young players, James McCarthy and James McArthur subsequently both signed for Wigan Athletic in England, where they won the 2013 FA Cup Final before moving on again for bigger fees, earning Hamilton a further windfall due to sell-on fees in the original transfers, with the money received being re-invested into the youth academy programme.

2010s Relegation occurred in 2011 and Reid departed two years later; his successor Alex Neil, the club captain who spent a period as youth coach then player-manager, put together another team featuring several more academy products which won promotion again in 2014, via the play-offs. After Accies briefly topped the Premiership table during the next campaign, Neil left the club to manage in England (along with Frankie McAvoy whose involvement in developing the youth system had also been significant) and it was again the captain to whom the club turned to take over as player-manager, with the new boss Martin Canning also fully aware of the club's desire to focus on youth development. Under his charge, the club managed to survive four seasons at the elite level (the longest such sequence since World War II, winning a relegation play-off in 2017 thanks to a goal by academy graduate Greg Docherty) despite blooding more inexperienced youngsters, many of whom were soon acquired by richer competitors and in turn were replaced by the next set of youth graduates. Despite the Hamilton players being exposed to high level football at a young age, they were rarely selected for national age group squads, with the players involved suggesting they may have been overlooked due to the stature of the club they played for.

In 2017, the Hamilton academy was one of eight across the country designated 'elite' status on the introduction of Project Brave, an SFA initiative to concentrate the development of the best young players at a smaller number of clubs with high quality facilities and coaching than was previously the case.

The 2017–18 season was challenging off the field for the club as they lost most of their funds in a high-value fraud, a large proportion of which had been earmarked for improvements to the youth academy. The also had to invest a significant sum in a new artificial playing surface after the existing one was voted the worst in Scotland, had to cope with the death of serving community coach and former youth player Matthew Craig, and suffered an arson attack on their stadium. However, by the end of the campaign they secured a new club sponsor (after the previous firm ceased trading), and maintained their place in the Premiership, while the Under-17 side – coached by first-team regulars Dougie Imrie and Darian MacKinnon – won the national title with an unbeaten record to qualify for the 2018–19 UEFA Youth League, becoming only the second Scottish club to participate in the competition after Celtic who had been Scottish champions at both senior and U17 level in the other relevant years. It would also be the first time that the club had taken part in an official UEFA competition at any level.

Early in 2019, Martin Canning was replaced as head coach by Brian Rice, who had no previous connection with Hamilton but a strong background in coaching young players.Hamilton Accies head of youth George Cairns enjoys successful season, Daily Record, 15 June 2019 Accies again survived to remain in the Premiership, and at the start of the following season Rice reiterated his intention to operate with a youthful squad, including academy graduates when possible.Brian Rice: Hamilton head coach wants younger squad next season, BBC Sport, 18 May 2019 The COVID-19 pandemic in Scotland caused many clubs to release players in the summer of 2020, with Hamilton only retaining seven reserves for the following season and instead organising several loan deals for their fringe players.Hamilton Accies send five players out on loan, Daily Record, 5 October 2020

2020s Hamilton were eventually relegated from the Premiership in 2021Hamilton Academical 0-2 Kilmarnock: Ayrshire side consigned to relegation play-off despite win, Thomas Duncan, BBC Sport, 16 May 2021Hamilton's Lewis Smith determined to use relegation pain in Accies' promotion bid next season, James Cairney, The Herald, 17 May 2021 and then dropped down from the Scottish Championship in 2023, both necessitating cost-cutting measures across the club, although the decision was made to remain full-time and maintain funding for the youth academy.Hamilton Academical stay full-time while 'change in ownership could be imminent', BBC Sport, 12 June 2023 In May 2024, Accies selected an entirely home-grown starting XI for a Scottish League One fixture against Kelty Hearts, which they won 4–1.Hamilton Accies team of academy graduates is 'the dream' for coach, Andy McGilvray, Daily Record via Yahoo News, 9 May 2024 A few weeks later, they returned to the Championship via the play-offs.Hamilton claim play-off glory to replace Inverness in Championship, STV News, 18 May 2024

In the summer of 2024, long-serving academy director George Cairns was replaced by Gordon Young.Hamilton Accies confirm former Sheffield United and Motherwell youth coach as Academy Director, Paul Thomson, Daily Record, 18 June 2024 The season that followed was particularly challenging for the club as a whole due to ongoing financial issues between the former and incumbent ownerships, culminating in a points deduction from the SPFL due to missed payments (leading to relegation), a transfer embargo and temporary relocation to Cumbernauld. In the wake of this, the club announced Scott Leitch as academy director, leading a coaching team including Michael Tidser, Kevin Harper and Darryl Duffy,Scott Leitch announced as Academy Director, Hamilton Academical FC, 24 July 2025 but stated it was pausing the youth academy for lower age groups (11-to 15-year-olds).Hamilton Accies pause once-revered youth academy but insist it's not the end, Andy McGilvray, Daily Record, 7 August 2025 It was soon confirmed that due to the cancellation of part of the structure, as well as being "unable to provide assurances to the Licencing Committee in eight different key areas, including facilities, coaching qualifications and Child Wellbeing and Protection standards", Hamilton would lose its Elite status in the Club Academy Scotland system, preventing them from fielding under-17 or under-19 teams for that season at least, with all youth players free to join other clubs.Inside the rise and fall of the Hamilton Accies academy, Graeme McGarry, The Herald, 16 August 2025 Hamilton Accies losing CAS Elite status confirmed by Scottish FA as players free to leave club, Andy McGilvray, Daily Record, 20 August 2025

Competitions In the early 1950s, reserve teams were incorporated into the third tier of the senior Scottish Football League, with Hamilton 'A' taking part for four seasons of the arrangement.Scottish Football League C Division overview, Scottish Football Historical ArchiveScotland - Final Tables Third Level 1924-2004, RSSSFHamilton Academical Reserves, Football Club History Database Accies also fielded a team for many years in various separate reserve competitions, culminating in the Scottish Premier Reserve League which was abandoned in 2009.

Prior to the introduction of the Scottish Premier League in 1998, the Under-20s previously competed in the youth league administered by the Scottish Football League.

For the 2016–17 edition of the Scottish Challenge Cup, Under-20 teams of Premiership clubs were granted entry to compete against adult teams for the first time in the modern era. That season, Hamilton Under-20s defeated Cumbernauld Colts of the Lowland League before losing to Albion Rovers. In the 2017–18 edition, they defeated their first SPFL senior opposition – Edinburgh City – in the first round but were elimated by Cove Rangers (Highland League) in the next. As Hamilton Under-21s, they defeated Clyde 4–1 in the 2018–19 competition's opening round before losing 3–2 to their counterparts from St Mirren in the next. The senior team was relegated from the Premiership in 2020–21, meaning they and not an under-age team would take part in the Challenge Cup in future seasons.

In July 2018, it was reported that reserve leagues would be reintroduced in lieu of the development leagues that had been in place since 2009. The top tier of the new SPFL Reserve League featured 18 clubs, whilst a second-tier reserve League comprised nine clubs. Other than a minimum age of 16, no age restrictions applied to the leagues. At the end of its first season (2018–19) several clubs intimated that they would withdraw from the Reserve League to play a variety of challenge matches, but Hamilton were one of those who chose to remain. The reserve team were awarded the 2019–20 SPFL Reserve League title, albeit only after the competition was halted early due to the COVID-19 pandemic.Hamilton Academical and Livingston Named Reserve League Champions, Scottish Professional Football League, 16 June 2020

UEFA Youth League 2018

From 2015 onwards it has been possible for the Hamilton academy to participate in the UEFA Youth League by the Under-17 side winning the previous season's league at that age group; they first achieved this in 2018.