SS Montanan was a cargo ship built in 1912 for the American-Hawaiian Steamship Company. During World War I service for the United States Army, she was known as USAT Montanan. Montanan was built by the Maryland Steel Company as one of eight sister ships for the American-Hawaiian Steamship Company, and was employed in inter-coastal service via the Isthmus of Tehuantepec and the Panama Canal after it opened.