Mark Jeremiah O'Mahony (born 14 January 2005) is an Irish footballer who plays as a striker for EFL Championship side Portsmouth on loan from Premier League club Brighton & Hove Albion.
[2][3] In January 2023, O'Mahony joined the academy of Brighton & Hove Albion for a reported fee of an initial £50,000, signing a three-year contract.
[4] On 12 November 2023, he was named among the match day squad in the Premier League as Brighton played at home against Sheffield United.
[6] On 13 April 2024, he made his senior debut for the club, coming off the bench in their 1–1 draw away to Burnley in the Premier League.
[10] In December 2022 he was named the FAI U17 player of the year after scoring fourteen goals in sixteen appearances for Irish youth international teams.