Sobiesław Jan Zasada (born 27 January 1930 in Dąbrowa Górnicza, Poland) is a Polish rally driver and economist.

Zasada won the European Rally Champion title in 1966 with Steyr-Puch 650 (the smallest vehicle to achieve such victory) and in 1967 with 4-cylinder Porsche 912.

In autumn of 1967 he was victorious driving his flat-six Porsche 911 in the Gran Premio Internacional de Turismo, a 2055-mile stage race across Argentina.

In next two seasons Zasada with his Porsche 911 was runner-up in European Rally Championship, conquered only by Pauli Toivonen in 1968 and Harry Källström in 1969.

In 1996 Reuters reported that his Polish automotive group Sobieslaw Zasada Centrum SA launched the construction of Mercedes' Vito mini-vans.