Beit Mery (Arabic: بيت مري ; also Beit Mer, Beir Meri) is a Lebanese town overlooking the capital Beirut. The town has been a summer mountain resort since the times of the Phoenicians and later the Romans.

The name derives from Aramaic and means "The house of my Lord". On one of the three hills of Beit Mery (Southern end of town) along the Lebanon Western mountain range are the ruins of the old Phoenician and Roman temples that were erected in the same general area in what is now known as Deir El-Qala'a (دير القلعة).

At present, a Christian church and monastery sit on top of parts of the old Roman temple. Les Scouts Du Liban Groupe Sainte Marie Beit Mery is one of the biggest movement in town and it is located in College des Freres since 1969. Beit Mery is home to a Lebanese Red Cross First Aid Center.

The town is the site of the annual Al Bustan festival, held in the theatre of the Al Bustan Hotel.

The residents of Beit Mery are mainly Christian, predominantly Maronite Catholic, with a significant minority of Greek Orthodox, Greek Catholic and Armenian Orthodox.

Beit Mery occupies a hill, 700–750 meters (2,300–2,460 ft) above sea level, which gives the town views of the Beirut peninsula and part of Lebanon's Mediterranean coast. It has an area of 5.48 km² (2.12 sq mi). Since 2000 Beit Mery started to be a suburban town and is 16 km (9.9 mi) away from Beirut.

Beit Mery's history dates back to ancient times. The town is home to the ruins of a Roman temple, indicating its importance during the Roman Empire. This temple, dedicated to the god Mercury, was part of a larger network of Roman religious sites throughout the region. The presence of such a structure suggests that Beit Mery was a notable settlement during Roman times. The Roman rulers of Lebanon made Beit Mery their summer resort due to its high location and summer weather.

There are two prehistoric archaeological sites in Beit Mery where flint industries have been found by Jesuit archaeologists: