The Nimrod Fortress or Nimrod Castle is a castle built by the Ayyubids and hugely enlarged by the Mamluks, situated on the southern slopes of Mount Hermon, on a ridge rising about 800 m above sea level. It overlooks the Golan Heights and was built with the purpose of guarding a major access route to Damascus against armies coming from the west.

Qalat or kalata (قلعه) in Persian, and qal'a(-t) or qil'a(-t) in Arabic, means 'fortress', 'fortification', 'castle', or simply 'fortified place'. The common English plural is "qalats".