Karol Pniak (26 January 1910 – 10 November 1980) was a Polish World War II flying ace of the Battle of Britain. Originally a pilot for the Polish Air Force in the September Campaign of 1939, he later flew with No. 32 Squadron of the Royal Air Force, during the Battle of Britain, where he was known by the nickname "Cognac." Karol Pniak claimed five victories in the Battle. He left active service in 1947 and returned to Poland, where he died in 1980. Pniak's final tally was 7 aircraft claimed destroyed, 2 shared destroyed, 2 "probables", 1 damaged, with 2 shared damaged.