Robert M. Utley
 Robert Marshall Utley (born October 31 1929) is an American author and historian who has written sixteen books on the history of the American West. He is a former chief historian for the National Park Service.The Western History Association annually gives out the Robert M. Utley Book Award for the best book published on the military history of the frontier and western North America (including Mexico and Canada) from prehistory through the 20th century.