Henry Washington Benham (April 17, 1813 – July 1, 1884) was an American soldier and civil engineer who served as a general in the Union Army during the American Civil War. Benham was born at Cheshire, Connecticut. He graduated at the top of his class from the United States Military Academy in 1837. He was connected with various government works as a member of the Engineer Corps, and served in the Mexican War in 1847-48. From 1849 to 1852, he was superintending engineer of the sea wall for the protection of Great Brewster Island, Boston Harbor, and from 1852 to 1853 of the Washington (D.C.) Navy Yard.