PIK-3b is a 1950s Finnish wooden single-seat glider designed by Antti Koskinen. It is a slightly refined version of the earlier PIK-3a, with new, shallower wing joints and air brakes in place of flaps. PIK-3b flew for the first time on 17 July 1955. Three were built: OH-YKB, OH-YKC and OH-YKD.
PIK-3b was further upgraded into the PIK-3c in the late 1950s.