Saint George Monastery or Deir Mar Georges (Arabic: دير مار جرجس) is a historic Greek Orthodox monastery in the village of al-Mishtaya in the "Valley of the Christians" (وادي النصارى, Wadi al-Nasara), belonging to the Homs Governorate in northwestern Syria, the place located just a few kilometers north of the famous castle Krak des Chevaliers.

It is said that the monastery was built over the remains of an ancient statue of the god Homerus by the Byzantine Emperor Justinian I sometime in the 5th century.

The wooden iconostasis found inside the church are decorated with impressive carvings and are magnificent presentations of art, its gold painted icons depict various scenes from the life of Christ.

The Saint George Monastery also displays many other ancient items like crosses, writings, books, carvings, goblets, and other tools.

It is also home to a manuscript written by the caliph Umar ibn al-Khattab, which discussed the relationships between Muslims and Christians.