John O'Mahony (1816–1877) was founder of the Irish Republican Brotherhood.
John O'Mahony may also refer to:
- John O'Mahony (Mayo politician) (born 1953), Irish Fine Gael politician representing Mayo and twice an All-Ireland winner managing the Galway Football Team
- John O'Mahony (Gaelic footballer) (born 1937), Irish retired Gaelic footballer
- John O'Mahony (Australian footballer) (born 1931), Australian footballer for Hawthorn
- Sean Matgamna (born 1941), also known as John O'Mahony, Trotskyist theorist
- Seán O'Mahony (1864–1934), Sinn Féin politician who represented the South Fermanagh constituency
- John O Mahoney, Irish Gaelic footballer
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