Sera Monastery (Tibetan: སེ་ར་དགོན་པ, Wylie: se ra dgon pa "Wild Roses Monastery"; Chinese: 色拉寺; pinyin: Sèlā Sì) is one of the "great three" Gelug university monasteries of Tibet, located 1.25 miles (2.01 km) north of Lhasa and about 5 km (3.1 mi) north of the Jokhang. (The other two are Ganden Monastery and Drepung Monastery.)

The origin of its name is attributed to a fact that during construction, the hill behind the monastery was covered with blooming wild roses (or "sera" in Tibetan). (An alternate etymology holds that the location that was surrounded by raspberry shrubs called 'Sewa' in Tibetan, that formed like a 'Rawa' in Tibetan, meaning "Fence".)

The original Sera Monastery is responsible for some 19 hermitages, including four nunneries, which are all located in the foothills north of Lhasa.

The Sera Monastery, as a complex of structures with the Great Assembly Hall and three colleges, was founded in 1419 by Jamchen Chojey of Sakya Yeshe of Zel Gungtang (1355–1435), a disciple of Je Tsongkhapa. During the 1959 revolt in Lhasa, Sera monastery suffered severe damage, with its colleges destroyed and hundreds of monks killed.

After the Dalai Lama took asylum in India, many of the monks of Sera who survived the attack moved to Bylakuppe in Mysore, India. After initial tribulations, they established a parallel Sera Monastery with Sera Me and Sera Je colleges and a Great Assembly Hall on similar lines to the original monastery, with help from the Government of India. There are now 3000 or more monks living in Sera, India and this community has also spread its missionary activities to several countries by establishing Dharma centres, propagating knowledge of Buddhism.

Sera Monastery in Tibet and its counterpart in Mysore, India are noted for their debate sessions.