Zbysław Ciołkosz (23 March 1902 – 25 June 1960) was a prolific Polish American aircraft designer, whose work includes the P.Z.L. 27, PWS-20, LWS-3 Mewa, RWD-11, LWS-6 Żubr, PWS-1, PWS-54, PWS-19, LWS-2, and PWS-52.