John O'Connor
John O'Connor may refer to:
Clergy
- John O'Connor (Archdeacon of Emly), Archdeacon of Emly, 1880–1904
- John J. O'Connor (bishop of Newark), Roman Catholic Bishop of Newark
- John O'Connor (priest), British Roman Catholic priest, model for the fictional detective Father Brown
- John O'Connor (cardinal), Roman Catholic Archbishop of New York
Politicians
- John O'Connor (Canadian politician)
- John O'Connor (Irish Parliamentary Party politician), Lord Mayor of Dublin and MP for South Kerry
- John O'Connor (North Kildare MP)
- John O'Connor (Australian politician), member of the South Australian House of Assembly
- John J. O'Connor (New York representative), US Representative from New York
- John J. O'Connor (Brooklyn politician), member of the New York State Assembly
- John M. O'Connor, Attorney General of Oklahoma
- John S. O'Connor, Irish politician
Sportspeople
- John O'Connor (English cricketer)
- John O'Connor (Australian cricketer)
- John O'Connor (Cork hurler)
- John O'Connor (athlete), Irish Olympic athlete
- John C. O'Connor, American college football coach
- Johnny O'Connor (baseball), Major League Baseball player
- Johnny O'Connor (hurler), Irish hurler who played for Waterford
- John O'Connor (Wexford hurler), Irish hurler who played for Wexford
- Johnny O'Connor, Irish rugby union player
Others
- John O'Connor (musician), British guitarist, television composer and recording artist
- John O'Connor (painter), Irish painter
- John Carroll O'Connor, full name of American actor Carroll O'Connor
- John Jay O'Connor, American lawyer and husband of United States Supreme Court Justice Sandra Day O'Connor
- John J. O'Connor (artist), American artist
- John J. O'Connor (historian), American historian and sociologist
- John J. O'Connor (journalist), American journalist and critic
- John J. O'Connor (mathematician), owner of MacTutor History of Mathematics archive
- John Kennedy O'Connor, television and radio broadcaster