Thomas 'Tam' O'Brien (born 7 August 1991) is a Scottish footballer who plays as a central defender for side Arbroath, where he is also club captain
O'Brien began his footballing career at Dunfermline Athletic's Academy, but moved to Cowdenbeath in 2003. He signed professional terms in 2007, and after loan spells with Rosyth and Kelty Hearts, he made his first team debut on 7 August 2010, in a 2âÂÂ0 home loss against Ross County. O'Brien scored his first professional goal on 1 October 2011, in a 1âÂÂ1 away draw against Arbroath.
At the end of the 2014âÂÂ15 season, O'Brien signed a two-year contract with Scottish League One side Forfar Athletic. He spent two seasons with Forfar, and was named in the 2016âÂÂ17 PFA Scotland League Two Team of the Year after helping his club return to League One.
O'Brien subsequently signed a two-year deal with Angus rivals Arbroath on 1 June 2017.
In 2019, O'Brien was part of the Arbroath squad that won the Scottish League One title, gaining promotion to the Scottish Championship. The Lichties would remain in the second tier for five seasons, the last three of which were spent as the only part-time club in the division, with O'Brien ever-present throughout much of this time. This included a memorable promotion challenge in season 2021-22, with Arbroath eventually succumbing to champions Kilmarnock on the penultimate matchday. Persistent injuries in the 2023âÂÂ24 season limited O'Brien to just 19 league appearances, as Arbroath were relegated from the Championship.
In April 2025, O'Brien captained Arbroath to the Scottish League One title with three games to spare, following a 4-0 victory over Stenhousemuir that secured an immediate return to the Championship.