The WN-3 was a Polish seven-cylinder air-cooled radial engine of the 1950s, produced by WSK-Kalisz, designed by Wiktor Narkiewicz.

In 1946, Wiktor Narkiewicz, who prior to the Second World War was technical director of the Czechoslovakian Avia aero-engine factory, was appointed chief designer of the Polish Central Engine Office, and later the Aero-engine department of the Polish Aviation Institute (Instytut Lotnictwa, IL).

He led the design of the WN-1, a 48 kW (65 hp) air-cooled flat-four piston engine which was the first post-war Polish aero-engine, followed by the 213 kW (285 hp) WN-2 in 1947, but both of these engines failed to enter production.

[1][2] The WN-3 entered production in 1956,[3] powering the PZL TS-8 Bies training aircraft.

[2] The engine was produced in 1957-1960 by WSK-Kalisz in Kalisz,[4] it might be known also as PZL WN-3, or (in Western sources) as Narkiewicz WN-3.