William Montrose Graham (September 28, 1834 – January 16, 1916) was a career soldier in the United States Army, reaching the rank of major general.

[1] His uncle and namesake, William Montrose Graham (1798–1847), was killed during the Mexican–American War while commanding the 11th U.S. Infantry at Molino del Rey.

Graham was commissioned into the 1st Regiment of Artillery in 1855, and earned two rapid promotions to captain with the outbreak of the Civil War.

Graham served with the Regular Army until April 1865, when he accepted a commission as colonel of the 2nd District of Columbia Infantry Regiment.

He died in Wardour, Maryland, on January 16, 1916, and was buried at Congressional Cemetery in Washington, D.C.[2] Graham married Mary Brewerton Ricketts, daughter of Major General James Brewerton Ricketts, in 1860 at Fortress Monroe, VA. Mary was born Aroostine in honor of her Native American heritage and Aroostook County birth.