Ab Saunders (October 14, 1851 – February 5, 1883) was an American cowboy, and at times gunman, best known for his association with Billy the Kid, Charlie Bowdre, Frank McNab, Doc Scurlock, and Saunders's cousins Frank and George Coe, when he was a member of the Lincoln County Regulators, a deputized posse, during the 1878 Lincoln County War in the New Mexico Territory (New Mexico did not become a U.S. state until 1912.)