John Cooney Mullally (born 28 November 1930 at Souris, Prince Edward Island) was a Liberal party member of the Canadian House of Commons. He was a teacher by career.He was first elected at the King's riding in the 1963 general election. After serving only one term in office, the 26th Canadian Parliament, Mullally was defeated at King's riding in the 1965 election by Melvin McQuaid of the Progressive Conservative party.