William "Red" Angus (born November 9, 1849 – c. 1922) was a former soldier and sheriff in Wyoming who became a principal leader and combatant during the infamous Johnson County War.
Sheriff Red Angus sided with the homesteaders, who he believed were being preyed upon by the cattle barons and large ranchers.
A large group of cattle barons and their hired gunmen murdered a prominent leader of the homesteaders, Nate Champion, on April 8, 1892.
Their siege caused a number of casualties on the cattle barons' side, before it was stopped by the arrival of the 6th cavalry from Fort McKinney.
The officer-in-charge, Colonel J.J. Van Horn, negotiated with Angus to allow them custody of the cattle barons and their gunmen in exchange for a proper trial.