John O'Callaghan may refer to: *

John O'Callaghan (Medal of Honor) Sergeant#United States, Sergeant John O'Callaghan (floruit, fl. 1868 – 1870) was an American soldier in the United States Army who served with the 8th Cavalry Regiment (United States), 8th U.S. Cavalry Regiment during the Indian Wars. He was ...

(1850–1899), American soldier and Medal of Honor recipient *

John O'Callaghan (politician) John O'Callaghan (?–1913) was National Secretary of the United Irish League and a staff writer on '' The Boston Globe''. References 1913 deaths United Irish League American male journalists Year of birth missing {{US-journalist-st ...

(died 1913), secretary of the United Irish League *

John O'Callaghan (musician) John O'Callaghan (born 1981) is an Irish musician and DJ, who mainly produces trance music. He also produces music under the aliases of Joint Operations Centre, Mannix, Henrik Zuberstein, and Stenna. He has collaborated with fellow Discover ar ...

, Irish musician and DJ * Liam McCarthy and John D. O'Callaghan, BT Young Scientists of the Year and EU Young Scientists of the Year, 2009 *

John Cornelius O'Callaghan John Cornelius O'Callaghan (1805 – 24 April 1883) was an Irish historian and writer. He is best remembered for his work ''History of the Irish Brigades in the Service of France''. Life O'Callaghan was born in Dublin. His father was a so ...

(1805–1883), Irish historian and writer *

John Joseph O'Callaghan John Joseph O'Callaghan (1838 – 2 November 1905) was an Irish architect who designed buildings in both England and Ireland. Life O'Callaghan was born in County Cork, Ireland. After training in Cork he came to Dublin to join the practice o ...

(1838–1905), Irish architect *

John O'Callaghan (singer) John Cornelius O'Callaghan V (born August 4, 1988) is an American singer-songwriter and musician. He is best known for being the lead vocalist, guitarist and pianist of American rock band The Maine (band), The Maine which he joined in 2007. He de ...

, vocalist and guitarist of The Maine * John O'Callaghan (American football) (born 1964), American football player in the 1987 Seattle Seahawks season

See also