SS Santa Rosa (later SS Athinai) was a passenger and cargo ocean liner built for the Grace Line for operation by its subsidiary Panama Mail Steamship Company of San Francisco. She was the first to be launched and operating of four sister ships, the others in order of launch being Santa Paula (11 June 1932), Santa Lucia (3 October 1932) and (30 November 1932). All four ships, dubbed "The Four Sisters" and "The Big Four" were noted as the finest serving the West Coast and were of advanced technology. All served in World War II as War Shipping Administration (WSA) troop ships. Both Santa Lucia and Santa Elena were lost in air and torpedo attacks off North Africa.