Jack Clifford

• Jack Clifford (actor), also known as Jack "Rube" Clifford, American actor of film and stage
• Jack Clifford, born Virgil James Montani, Italian-born American boxer and ragtime dancer, former husband of Evelyn Nesbit
• Jack Clifford (rugby union), Australian-born rugby union player who played for England
• John [Cliff (actor)], born as Jack Clifford, American actor of film and television