The Temple of Zeus Hypsistos is an ancient Roman temple dedicated to the god Zeus, located in the present day town of Al-Dumayr, Syria, located 45 km north-east of Damascus, and known historically as Thelsea.
While its construction date is unknown, it was probably a Nabatean building, likely converted to a temple around the 2nd century.
In one of its inscriptions, it mentions a case heard by Emperor Caracalla in Antioch around 216, about the corruption in the temple's priesthood.