Grzywacz ( ) is a Polish surname. Notable people with the surname include:
Maciek Grzywacz, Polish jazz and classical pianist Szlama Grzywacz (1909–1944), Polish member of the French Resistance Zbylut Grzywacz (1939–2004), Polish painter, sculptor and graphic artist
See also Grzywacz, West Pomeranian Voivodeship, village in Poland