Olszak may refer to:
Places Olszak, Greater Poland Voivodeship (west-central Poland) Olszak, Masovian Voivodeship (east-central Poland) Olszak, West Pomeranian Voivodeship (north-west Poland)
People with the surname Grzegorz Olszak (1969–), Polish diplomat Wacław Olszak (1868–1939), Polish physician and politician
See also Olschak