Birtley is a town in the Metropolitan Borough of Gateshead, in Tyne and Wear, England. It is situated to the south of Gateshead and is conjoined to Chester-le-Street across the county boundary in County Durham.
Until 1974, Birtley and the adjoining areas of Barley Mow, Vigo and Portobello were part of Chester-le-Street Rural District under County Durham until being moved into Tyne and Wear under the Borough of Gateshead. It forms an urban area with nearby Chester-le-Street, Washington, Houghton le Spring, Hetton le Hole and Sunderland as part of Wearside. Birtley was a civil parish with a parish council (which also covered the adjoining neighbourhoods) until 1 April 2006, after a local referendum agreed to abolish it. The former parish had a population of 11,377 in 2001. The ward of Birtley in the Gateshead MBC had a population of 8,367 in the 2011 Census.