The PWS-35 Ogar (English: Polish Hound) was a two-seat, aerobatic training biplane that was designed by Kazimierz Nowicki, Marian Piątka and Michał Rosnowski at the Politechnika Lwowska in 1935/1936.

The aircraft was designed by three young scientists at the Lvov University of Technology ("Polytechnic") as their thesis.

The first prototype, equipped with a de Havilland Gipsy Major engine,[1] was heavier than anticipated and as a result the aircraft had poor stall characteristics and stability issues.

[1] Michał Rosnowski designed further modifications and the aircraft was scheduled to enter serial production in late 1938,[2] however, numerous problems with handling and weight and balance postponed the start of serial production until late 1939.

[1] Out of the first batch of 17 airframes started in July 1939, none were delivered to the Polish Air Force by the invasion of Poland.