Kletno Bear Cave (Polish: Jaskinia Niedźwiedzia w Kletnie) is the longest cave located in the Śnieżnik Mountains, which are part of the greater Sudeten mountain range.

[1] The first 200 m (660 ft) of the cave was discovered in October 1966 during the mining process in the newly established quarry Kletno III.

[1] The cave is situated on the right side of the valley of the stream Kleśnica in the Śnieżnik Mountains, a part of the Sudetes.

The cave is located at 790 m above sea level on the slopes of Góra Stroma mountain (1,166.8 m).

Rich bone material of Pleistocene animals was found inside the cave, including mostly mammals such as brown bear, cave lion, hyena, wolf, wild boar, and others.