Gerard Peter O'Brien (born 12 November 1942) is a former Irish first-class cricketer.
O'Brien was born at Dublin in County Down and was educated in the city at O'Connell School.
A wicket-keeper for Malahide at club level, O'Brien played two first-class cricket matches Ireland.
The first came against Scotland at Glasgow in 1976, with his second match coming against the same opposition at Dublin in 1977.
Across his two first-class matches, O'Brien scored a total of 22 runs, with a high score of 11.
He worked in the insurance industry as his profession.