Klevan Castle (Ukrainian: Клеванський замок) is one of the oldest forts in Volynia, Ukraine.

It was built in the mid-15th century by Prince Michael Czartoryski in order to control a ford over the Stubla River.

Klevan was the main seat of the Orthodox princely house of Chortoryisk until its members converted to Catholicism in the 17th century.

The remaining portions include two towers, three fortified buildings, and a high four-arched bridge leading to the main gate.

The castle quickly lost its defensive function, and in 1632 the building was given to the Jesuits, who set up their college here.