SS Tyndareus was a British steamship that was built in 1914–15 as a cargo liner for the Blue Funnel Line of the Ocean Steamship Company. Completed during the First World War, she served as a troop ship and was nearly sunk by a German naval mine, but without loss of life. Between the wars she operated commercially in the Pacific Ocean, before returning to military service in the Second World War. Her final civil role was to carry Islamic pilgrims from Indonesia to Mecca, before being scrapped in 1960.