PZL.50 Jastrząb (Hawk) was a Polish late 1930s fighter aircraft designed by Wsiewołod Jakimiuk at Państwowe Zakłady Lotnicze. The single-seat low-wing monoplane was to serve as a multi-purpose fighter and escort to replace all other fighters in the Polish Military Aviation. Designed after 1936, its prototype first flew in February 1939. By September, the first production aircraft were nearing completion, but further development was interrupted by the Nazi-Soviet Invasion of Poland.

PZL was the main Polish aerospace manufacturer of the interwar period, and a brand of their aircraft. Based in Warsaw between 1928 and 1939, PZL introduced a variety of well-regarded aircraft, most notably the PZL P.11 fighter, the PZL.23 Karaś light bomber, and the PZL.37 Łoś medium bomber.