Osek is a village in Rokycany District, in the Plzeň Region, Czechia. Osek lies at 403 m above sea level. It has 1,433 inhabitants (2024). The nearest city is Bolevec, 15.9 km to the west. Among the landmarks around are Cathedral of St. Bartholomew (15.7 km), Great Synagogue (16.1 km) and Plasy Monastery (23 km). Among the natural features are Vršíček (2.8 km) and Žďár (6.5 km).
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