Robert Murray Morris (1824–1896) was a military officer in the U. S. Army and Union Army. From 1846, he served as a U. S. Army officer in the Mexican–American War and in the antebellum western frontier of the United States in the Regiment of Mounted Rifles, renamed 3rd Cavalry Regiment in August 1861 at the start of the American Civil War. From 1863 he served as a Major in the 6th Cavalry Regiment in the Civil War and afterwards in Texas and Kansas until his retirement in 1873.[1]