Gmina Olkusz is an urban-rural gmina (administrative district) in Olkusz County, Lesser Poland Voivodeship, in southern Poland.

Its seat is the town of Olkusz, which lies approximately 37 kilometres (23 mi) north-west of the regional capital Kraków.

The gmina contains part of the protected area called Kraków Valleys Landscape Park.

Apart from the town of Olkusz, Gmina Olkusz contains the villages and settlements of Bogucin Mały, Braciejówka, Gorenice, Kogutek Kosmołowski, Kosmolów, Niesułowice, Olewin, Osiek, Pazurek, Podlesie, Rabsztyn, Sieniczno, Troks, Wiśliczka, Witeradów, Zawada, Zederman, Zimnodół and Żurada.

Gmina Olkusz is bordered by the town of Bukowno and by the gminas of Bolesław, Jerzmanowice-Przeginia, Klucze, Krzeszowice, Sułoszowa, Trzebinia, Trzyciąż and Wolbrom.