SS Merion was an ocean liner built in 1902 for the American Line, a subsidiary line of the International Mercantile Marine (IMM). She also sailed for the Red Star Line and the Dominion Line—both subsidiary lines of IMM—during her passenger career. After the outbreak of World War I she was bought by the British Admiralty and converted to serve as a decoy resembling the Royal Navy battlecruiser HMS Tiger. In May 1915, while posing as Tiger in the Aegean Sea, Merion was sunk by the German submarine .