Sedgefield is a local government district and borough in County Durham, in north-east England. It has a population of about 87,000 (2001 UK census). It is named after Sedgefield; but its largest town is Newton Aycliffe. Other places include Shildon, Ferryhill and Spennymoor.

The borough was formed in 1974, under the Local Government Act 1972, by the merger of Sedgefield Rural District, Spennymoor and Shildon urban districts and part of Darlington Rural District.

The district will be abolished as part of the 2009 structural changes to local government in England.

Electorial divisions

• Aycliffe East Aycliffe Village, Neville and Shafto St Marys parish wards of Great Aycliffe parish
• Aycliffe North Woodham ward; Woodham South parish ward of Great Aycliffe parish
• Aycliffe West West ward; Simpasture parish ward of Great Aycliffe parish
• Chilton Chilton ward; Cornforth parish; Merrington parish ward of Spennymoor parish
• Ferryhill Broom ward; Ferryhill ward
• Sedgefield Sedgefield ward; Bishop Middleham parish
• Shildon East Greenfield Middridge ward; Thickley ward
• Shildon West Byerley ward; Sunnydale ward
• Spennymoor and Middlestone Spennymoor ward; Byers Green and Middlestone parish wards of Spennymoor parish
• Trimdon Fishburn and Old Trimdon ward; New Trimdon and Trimdon Grange ward
• Tudhoe Low Spennymoor and Tudhoe Grange ward; Tudhoe ward

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