Sailing on 20 July, "Pollack" spent her eighth war patrol off the east coast of Kyūshū, Japan. On 6 August she scored a torpedo hit on one ship in a convoy. Early on 27 August 1943, "Pollack" picked out one of five merchant ships off the coast of Kyūshū and pressed home an attack which sank the 3,520-ton passenger/cargo ship "Taifuku Maru". On 3 September she sank the 3,521-ton cargo ship "Tagonoura Maru". She returned to Pearl Harbor on 16 September.