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