Ostaszewski

Ostaszewski is a Polish masculine surname, its feminine counterpart is Ostaszewska. It may refer to
 * Ostoja-Ostaszewski, Polish noble family
 * Mateusz Ostaszewski (born 1998), Polish football midfielder
 * Maja Ostaszewska (born 1972), Polish actress
 * Piotr Ostaszewski (born 1964), Polish historian, political scientist, translator