Bezručovo údolí, Natural monument in the Ore Mountains near Chomutov, Czech Republic

Bezručovo údolí is a protected valley of the Chomutovka River in the Ore Mountains, between Chomutov and Hora Svatého Šebestiána. The canyon-like valley cuts through the Loučenská hornatina highlands, and the protected area spans an elevation difference of more than 400 metres. Acidophilous beech forests cover about 35% of its area.

The area was originally called Grundtal, named for its broad valley setting, before being renamed in 1947. The new name honors Czech poet Petr Bezruč as part of post-war cultural changes in the country.

The valley's name recalls the Czech poet Petr Bezruč, adopted in 1947; before that it was called Grundtal. The former First and Second Dolský mills now house restaurants and accommodation, while the Third Mill site marks the divide between the reserve's two sections.

Marked hiking and cycling trails run through the valley connecting various small communities and landmarks. The network offers multiple entry points and routes suitable for different fitness levels and time availability.

The reserve is split into two sections at the site of the former Třetí mlýn (Third Mill). The two drinking-water reservoirs, Kamenička (1904) and Křimov (1958), lie just outside the protected boundary. Wet meadows are managed for the scarce large blue and dusky large blue butterflies.