Deir El Ahmar (Arabic: دير الأحمر‎) is a Lebanese town, located at 100 km from Beirut and 12 km northeast of Baalbeck in the Bekaa Valley in Lebanon.

The population of Deir el Ahmar is around 23,000 people. The people of Deir el Ahmar are Lebanese and followers of the Maronite church. With eight historical churches, including Saint Joseph Church which was completed on September 15, 1914, Our Lady of the Tower Church which was built the ruins of the temple of Jupiter, Saint Georges, Saint Nohra, Saint Michel (old + New), Saint Elie, Our Lady of Cultivation and two musk temple one of them for man and the other for ladies. The town serves as the center of the archbishopric of Baalbek–Deir El-Ahmar.

Deir el Ahmar's climate is mild during spring and autumn, dry and warm in summer, and cold during winter. With an altitude that ranges between 950 m and 1,150 m above sea level, the town receives heavy snow during the winter, and some roads leading to the town may be temporarily closed during this period. Deir el Ahmar area is about 42 hectar (42.000 000 m2)