Peter Thomas Gain (born 11 November 1976) is a footballer.
He has previously played for Lincoln City, Dagenham and Redbridge, Tottenham Hotspur and Peterborough United.
Although born in Hammersmith, England, Gain represented the Republic of Ireland at youth, U-21 and B levels.
In May 2012, Gain was released by Dagenham due to the expiry of his contract.