The PZL.50 Jastrząb (hawk) was a Polish pre-war fighter aircraft design by of the PZL works. The single-seat low-wing monoplane was to serve as a multi-purpose fighter and escort to replace all other fighters in the Polish Air Force. Designed after 1936, its prototype first flew in February 1939. A further two prototypes were under construction by the time of the Invasion of Poland, but the fighter never entered mass production.