The Dulebs (Дулёбы in Russian) were a tribe of Early East Slavs between the 6th (still questionable) and the 10th centuries.

Historians are still not sure of the exact location of the native Duleb territory due to sparseness of numerous traces of the tribe's presence, found by researchers in Central and Eastern Europe. It is possible that the Duleb tribe formed in the times of the Roman Empire somewhere in the vicinity of the Germanic tribes and later settled in different regions. Some medieval sources mention the Dulebs' presence in Western Volhynia, today's Czech Republic, Middle Danube, between the Lake Balaton and the Mursa River etc.

According to the Primary Chronicle, the Dulebs suffered greatly from the invasion of the Avars in the late 6th - early 7th century. In 907, the Duleb unit took part in Oleg's military campaign against Czargrad. The Dulebs and their ruler were mentioned in one of the works of an Arab geographer Al-Masudi.

It appears that the Duleb tribe disintegrated in the 10th century, assimilated with the Volhynians and Buzhans and became part of the Kievan Rus'.