Bloody Knife (Sioux:Tamena Way Way or Tamina WeWe; Arikara:Nes I Ri Pat or Nee si Ra Pat; ca. 1840 – June 25, 1876) was an American Indian who served as a scout and guide for the U.S. 7th Cavalry Regiment. He was the favorite scout of Lieutenant Colonel George Armstrong Custer and has been called "perhaps the most famous Native American scout to serve the U.S. Army."