The PZL-102 Kos (blackbird) is a Polish two-seat touring and training monoplane designed and built by PZL.

First flown on 21 May 1958 by Mieczysław Miłosz the PZL-102 was designed as a semi-aerobatic two-seat light monoplane and was later given the name Kos.

The Kos was an all-metal low-wing cantilever monoplane with fabric tail control surfaces.

It had a fixed tailwheel landing gear and the prototype had a nose-mounted 65 hp (48 kW) Narkiewicz WN-1 flat-four engine.

After a number of prototypes the production aircraft (designated PZL-102B) first flew in October 1959, with Continental C90 engine and changed wing construction.