HMAS Upolu was a submarine depot ship operated by the Royal Australian Navy (RAN) during World War I. She was built by Fleming & Ferguson, Paisley, Scotland in 1891, for the Union Steam Ship Company. She was requistioned by the RAN on 18 August 1914 and converted into a submarine depot ship and after a short commission, she was returned to her owners on 9 December 1914. She was sunk in a collision with the Lienhsing off the Shantung Promontory on 12 August 1930.