The Derg was a military junta that ruled Ethiopia from 1974 to 1987.

Derg may also refer to:

Derg, Iran, a village in Qazvin Province

Ireland Bodb Derg, a legendary figure in Irish mythology Cróeb Derg, or Red Branch, the name of two royal houses of Ulster Lough Derg (Shannon), a large lake on the River Shannon, bordering counties Clare, Galway and Tipperary Lough Derg, County Donegal, a small lake, a place of Christian pilgrimage River Derg, Ulster

See also Durg, a city in Chhattisgarh state, India