The United States Marine Hospital, formerly known as Frank S. Keeler Memorial Hospital, is a historic Greek Revival hospital building in Mobile, Alabama, United States. Construction began in 1838 and was completed in 1842. It was designed by architect Frederick Bunnell and was operated by the Marine Hospital Service from its opening until it closed, in 1952. It treated injured Confederate and Union soldiers during the American Civil War. It shares some design features, such as its two-story colonnades, with its neighbor, the old Mobile City Hospital.