SS Faja de Oro ("Band of Gold") was an oil tanker built in 1914. She sailed for a number of companies, and survived service in the First World War, only to be torpedoed and sunk by a German U-boat during the Second World War while sailing under the Mexican flag in the Gulf of Mexico. Her sinking contributed to Mexico's decision to enter the war on the side of the Allies. The sinking of Faja de Oro, coming as it did a week after the sinking of the Mexican tanker Potrero del Llano on 14 May by Reinhard Suhren's U-564 contributed to Mexico's declaration of war on Germany on 1 June 1942.