Hartenštejn Castle, Gothic castle ruin in Bochov, Czech Republic.

Hartenštejn Castle is a Gothic ruin standing on elevated ground near Bochov, displaying remnants of stone walls and foundations. The preserved structures offer insight into the medieval military architecture and fortification methods of the period.

Hartenštejn was built from around 1471 by Heinrich II of Plauen as a replacement for Hungerberg Castle, destroyed in 1469, and was inhabited from 1473. It was named after the Hartenstein county on the Zwickauer Mulde. Deserted by 1573, it was partly restored by Adam the Elder of Steinsdorf and finally abandoned after 1609.

The castle's name recalls the county of Hartenstein on the Zwickauer Mulde, granted to the lords of Plauen by King Sigismund on 21 July 1426; Heinrich II named his new seat Neuhartenstein after it. The ruin is protected as a cultural monument and is reached by a turnoff from the red-marked hiking trail south of Bochov.

The ruin stands about one kilometre south of Bochov at 730 metres, reached by a turnoff from the red-marked hiking trail. The path climbs a solitary hill and the ground around the walls is uneven, so wear sturdy shoes.

The castle well on the north-east side of the courtyard was found during repairs in the 1930s to reach a depth of 34 metres. The site was protected as a cultural monument in 1964.