William Nyuon Bany Machar (1930 – 13 January 1996) was a Southern Sudanese politician who was also one of the founders of the Sudan People's Liberation Army (SPLA). He was appointed third in command after John Garang and Kerubino Kuanyin Bol. While he worked as a commander of the SPLA he lived in Itang, a small Ethiopian town in the Gambela Region.