Rudník (until 1952 Heřmanovy Sejfy; German: Hermannseifen) is a municipality and village in Trutnov District in the Hradec Králové Region of the Czech Republic.

Rudník consists of three municipal parts (in brackets population according to the 2021 census):[2] Rudník is located about 12 kilometres (7 mi) west of Trutnov and 41 km (25 mi) north of Hradec Králové.

It was founded during the colonization of the Giant Mountains in the 13th century by German immigrants who mined ore here.

In 1790, the estate was bought by the Barons Theers of Silberstein, who had the castle and stone school building built in the village.

In 1598–1602, it was rebuilt in the Renaissance style, but the late Gothic tower has been preserved.