Gruna is a village in Svitavy District, in the Pardubice Region, Czechia. Gruna lies at 408 m above sea level. It has 254 inhabitants (2024). The nearest city is Prostějov, 42 km to the southeast. Among the landmarks around are Bouzov Castle (12.5 km), Moravská Třebová Castle (5.5 km) and Mírov Castle (8.3 km). Among the natural features are Mladeč Caves (21 km) and Caves of Javoříčko (16.4 km).