Jacek Ostaszewski (born 5 May 1944) is a musician, double bassist, flautist, composer and theatre director.
He is the son of Tadeusz Ostaszewski[pl], a sculptor and professor at the Kraków Academy of Fine Arts, and Krystyna Ostaszewska[pl] née Dębowska, an actress at the Rhapsodic Theatre in Kraków. He is the husband of Małgorzata Ostaszewska and the father of Maja Ostaszewska.[1]