Deir el Qamar(in Arabic دير القمر , meaning "Monastery of the Moon") is a village in south-central Lebanon, five kilometres outside of Beiteddine, consisting of stone houses with red-tiled roofs. During the 16th to 18th centuries, Deir el Qamar was the residence of the governors of Lebanon. It is also notable for its 15th century Fakhreddine Mosque, Fakhreddine II Palace, and other historical palaces and administrative buildings. The 17th century Deir el Qamar Synagogue is also in the village, although closed to the public.
It was the first village in Lebanon to have a municipality in 1864, and it is the birthplace of many well known personalities, such as artists, writers, and politicians.
It was the capital of the Druze Cancimat of Lebanon (1840-1860).