Dumeir, also Dumair, Damir and Dumayr (Arabic: الضمير) is a city located 45 kilometers north-east of Damascus, Syria.

An altar dedicated to the Semitic deity, Baalshamin in 94 CE, now in the Institut du Monde Arabe in Paris, indicates that a Nabatean religious building previously stood on the site.

There is a reference to a building in a lawsuit in 216, however in 245 CE, in the reign of the Roman Emperor Philip the Arab, the Roman Temple of Dumeir, located in the center of the old town, was dedicated to Zeus Hypsistos The shape is highly unusual, and construction may have commenced as a public fountain or staging post, but in its final form it is clearly a temple.

[1] The Ghassanid phylarch (tribal king) al-Mundhir III ibn al-Harith built a tower at Dumayr.

[2] A monastery associated with the Ghassanids called Dayr al-Matirun, likely an Arabicized version of the Greek martyrion, existed about 3 kilometers (1.9 mi) east of Dumayr.