Bethal Z. Mullins (1853-1898) was an American outlaw of the Wild West who was active in the New Mexico Territory during the 1890s. In 1898, he and an army of fellow outlaws attacked Fort Mercer, which was defended by a force of Del Lobo Gang gunslingers, the Arizona Kid, Iron-Sights Jones, and Little Pete, and he was among the hundreds of outlaws left dead from the ensuing battle.