Kluisbergen (Dutch pronunciation: [ˈklœyzˌbɛrɣə(n)]) is a municipality located in the Belgian province of East Flanders, along the Scheldt river.

Kluisbergen is also home to the "Kluisbos", a forest which has 2 ancient standing stones, dating back to Roman times.

Traveling south or southeast is met with an increasing moderately hilly landscape all the way to the southern border There are three main hills in Kluisbergen.

The Kluisberg is mainly located on the border of Ruien and Orroir, stretching all the way to Kwaremont.

The Hotondberg is located on the border of Zulzeke and Ronse and is the highest point of East Flanders.