Olsztyn [ˈɔlʂtɨn] is a village in Częstochowa County, Silesian Voivodeship, in southern Poland. It is the seat of the gmina (administrative district) called Gmina Olsztyn. It lies approximately 12 kilometres (7 mi) south-east of Częstochowa and 59 km (37 mi) north of the voivodeship capital Katowice.

The village has a population of 2,331. It contains the ruins of a 14th-century castle.