The Second Battle of Cárdenas was a secondary naval engagement of the Spanish–American War fought on 11 May 1898 in the port of Cárdenas, Cuba, between an American squadron of 5 ships under Captain Chapman C. Todd and 3 small Spanish vessels under Mariano Mateu. The battle resulted in an unusually costly American reverse that dissuaded the U.S. Navy from undertaking further attacks on the port.