USAT McClellan was a United States Army transport ship that saw service during the Spanish-American War and World War I. She also participated in the occupation of Veracruz in 1914. McClellan was originally SS Port Victor, a steel-hulled passenger-cargo screw steamer built for Anglo-Australian service in the 1880s. Eventually converted into an early example of a refrigeration ship, Port Victor continued in Australian service until shortly before her sale in 1898 to the United States government for use as a transport during the Spanish-American War.