Ralf-Stetysz ([ˈralf stɛtɨʂ]) was the marque of one of the earliest Polish car manufacturers begun in France and transferred to Poland in the 1920s.

[1] It was formed in 1924, when Count Stefan Tyszkiewicz, an inventor and mechanical engineer, started a small automotive firm "Automobiles Ralf Stetysz" in Boulogne-Billancourt near Paris.

[3] The prototype proved interesting and in 1927 Tyszkiewicz was able to secure cooperation with the Warsaw-based K. Rudzki i S-ka company to start serial production, under the Stetysz brand.

Tyszkiewicz wanted to rebuild the factory, but the move was blocked by shareholders of K. Rudzki & S-ka, a firm specialising primarily in bridge construction.

Eventually, Stefan Tyszkiewicz resigned himself to discontinue his own brand and focused instead on importing and producing, under licence, FIAT and Mercedes models.