John Monaghan

John Monaghan may refer to:
 * John R. Monaghan, United States Navy officer
 * John James Joseph Monaghan, American prelate of the Roman Catholic Church
 * Rinty Monaghan (John Joseph Monaghan), flyweight boxer from Belfast
 * Jack Monaghan (1921–2022), New Zealand amateur wrestler
 * John Monaghan (businessman), New Zealand dairy executive with Fonterra