Henry Boynton Clitz (July 4, 1824 – October 30, 1888) was a career United States Army officer who served with distinction in the Mexican–American War and in the Union Army during the American Civil War.
He received brevet appointments for his service in both wars.
After his release as a prisoner of war from the Confederate Libby Prison in Richmond, Virginia on July 17, 1862, he was Commandant of Cadets at the United States Military Academy at West Point, New York, from October 23, 1862 to July 4, 1864.
Clitz was nominated and confirmed for appointment as a brevet brigadier general in the Regular Army (United States) on March 2, 1867 to rank from March 13, 1865.
He retired from the Regular Army as colonel of the 10th Infantry Regiment (United States) on July 1, 1885.
Clitz, whose deteriorating mental state had been noticed by relatives for several months, disappeared at Niagara Falls, New York, and was presumed drowned on October 30, 1888.