Olsza may refer to the following places in Poland:
, part of the Grzegórzki and Prądnik Czerwony districts of Kraków Olsza, Lower Silesian Voivodeship (south-west Poland) Olsza, Kuyavian-Pomeranian Voivodeship (north-central Poland) Olsza, Podlaskie Voivodeship (north-east Poland) Olsza, Łódź Voivodeship (central Poland) Olsza, Greater Poland Voivodeship (west-central Poland)
See also Olza (disambiguation)