Thomas Monaghan

• Thomas Monaghan (VC), British recipient of the Victoria Cross
• Thomas J. Monaghan (politician), American politician
• Thomas J. Monaghan (attorney), American attorney
• Thomas Monaghan (hurler), Irish hurler
• Tom Monaghan, American entrepreneur
• Tom Monaghan (dual player), Irish hurler, Gaelic footballer and coach
• Tommy Monaghan, a fictional super powered Hitman in DC Comics