Žernov is a market town in Náchod District in the Hradec Králové Region of the Czech Republic.

Žernov consists of two municipal parts (in brackets population according to the 2021 census):[2] Žernov is located about 7 kilometres (4 mi) northwest of Náchod and 28 km (17 mi) northeast of Hradec Králové.

The market town is situated on a plateau above the Úpa River, which flows along the eastern municipal border.

Smaller part of the Grandmother's Valley (Babiččino údolí) National Nature Monument, which stretches along the river, is located in the municipal territory.

Today, the ruins of the castle consist of only two cellars and small remnants of walls.