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The PZL P.11 was a Polish fighter aircraft, designed and constructed during the early 1930s by Warsaw-based aircraft manufacturer PZL. Possessing an all-metal structure, metal-covering, and high-mounted gull wing, the type held the distinction of being widely considered to have briefly been the most advanced fighter aircraft of its kind in the world.The design of the P.11 commenced during the late 1920s, initially designated as the P.1. The primary individual responsible for its development was Polish aeronautical engineer Zygmunt Puławski, who has been attributed as having designed many of its innovative features. While the majority of the world's forces were still using biplanes, the P.1 used a high-mounted and aerodynamically clean gull wing, which provided the pilot with a superior field of view. During September 1929, the first prototype conducted its maiden flight. The design quickly drew international attention; the general layout became commonly known as the "Polish wing" or "Puławski wing".

The P.11 served as Poland's primary fighter defence throughout the 1930s, including during the Polish campaign of 1939 by neighbouring Nazi Germany. However, as a consequence of the rapid advances in aircraft design during the late 1930s (seen in such fighters as the Messerschmitt Bf 109), it was outclassed by its rivals at the onset of the war. The majority of the Polish Air Force's P.11s were destroyed during 1939; however, it is believed that as many as 36 were flown to Romania and were subsequently taken over by the Romanian Air Force.

The P.11 was a considerable export success. During October 1933, deliveries of Polish-built P.11bs to Romania commenced.