Leon Stanislaw Niemczyk (15 December 1923 – 29 November 2006) was a Polish actor.
Niemczyk appeared in over 500 films and television shows over the course of his career.
His most memorable roles were Fulko de Lorche in Aleksander Ford's The Teutonic Knights, Andrzej in Roman Polanski's Knife in the Water and Jerzy in Jerzy Kawalerowicz's Night Train.
During World War II, he served under Gen.