Jack

Jack may refer to:


 * Jack (DWAN: The Devil-Birds of Corbo, The Playthings of Fo)
 * Jack (NA: Cat's Cradle: Witch Mark)
 * Jack (NA: Warlock, Warchild)
 * Jack Harkness, a 51st century con artist who travelled with the Doctor.
 * Jack Harkness (TW: Captain Jack Harkness)