Henery Oscar One Bull (Lakota: Tȟatȟáŋka Waŋžíla in Standard Lakota Orthography) (circa 1853-1947) was a Lakota Sioux man best known for being the nephew and adopted son of the holy man, Sitting Bull. He was also the younger brother of White Bull, a famous Lakota warrior and chief contributor to Stanley Vestal's biography of their uncle. He wore his uncle's shield during the Battle of Little Bighorn.