Adam O'Brien (born 11 July 1993) is an English professional rugby league footballer who plays as a hooker for Halifax Panthers in the Championship.

He has previously played for the Huddersfield Giants and Bradford Bulls in the Super League and the Championship, spending time away from Odsal with the Dewsbury Rams in 2013.

Playing for King Cross Park RLFC a Halifax based community club as a junior which he is still heavily involved in.

He joined Bradford Junior Development system and was called up to the England Knights in 2019 along with 3 other Giants players.

O'Brien made his Super League début against Huddersfield, however he was not selected until later against Hull Kingston Rovers and played until the match against the Wakefield Trinity Wildcats.

Adam played in the Championship Shield Game 1 Whitehaven to the Final Sheffield Eagles.

[citation needed] Following Bradford's liquidation prior to the 2017 season, O'Brien signed a three-year deal following teammate Alex Mellor to Huddersfield in the Super League.

On 5 October 2023, it was reported that he had signed a 3 year permanent deal with his hometown club Halifax commencing the 2024 season.

[6] O'Brien appeared as an interchange in a victory against France U18 in June 2010 and in both tests against the Australian Schoolboys in December 2010, England Academy won the series 2–0 with both games being played at Leigh Sports Village.