Lake Assad (Arabic: بحيرة الأسد, Buhayrat al-Assad) is a reservoir on the Euphrates in Raqqa Governorate, Syria.

[4] In 1975, Iraq complained that the flow of the Euphrates had been reduced below an acceptable level and threatened to bomb the Tabqa Dam; mediation by Saudi Arabia and the Soviet Union eventually settled this dispute.

Excavated sites include Tell Abu Hureyra, Emar, Habuba Kabira, Mureybet, Tell es-Sweyhat, Tell Fray and Dibsi Faraj.

At Qal'at Ja'bar, a castle on a hilltop later turned into an island, a protective glacis was built and two minarets at Mureybet and Meskene were relocated beyond the flood zone.

Lake Assad is an important wintering location for migratory birds and the government before 2004 undertook measures to protect certain shore areas from hunters by downgrading access roads.

This drop is possibly caused by the power station of the Tabqa Dam, which pumps more water out of the lake than is supplied by the Euphrates.