The PWS-51 was a Polish sports plane of 1930, a single-engine low-wing monoplane, constructed by the Podlaska Wytwórnia Samolotów (PWS), that remained a prototype.

The plane was designed in 1929 by Stanisław Cywiński in Podlaska Wytwórnia Samolotów, on factory's initiative, specially to participate in the Challenge 1930 international touring aircraft contest (along with PWS-50, PWS-52 and PWS-8).

The plane was built with a financial help of LOPP organization and it was first flown in spring of 1930 by Franciszek Rutkowski in Biała Podlaska.

He completed most of a rally over Europe, but had to withdraw after a forced landing near Vienna on July 28, due to an oil pipe damage.

Data from Jane's all the World's Aircraft 1931,[1] Poser - PWS - Podlaska Wytwórnia Samolotów  : PWS-51[2]General characteristics Performance