Sedgefield was a constituency in County Durham represented in the House of Commons of the UK Parliament from 2019 until its abolition for the 2024 general election by Paul Howell of the Conservative Party.

Subject to major boundary changes, though retaining the town of Sedgefield, the constituency was reformed as Newton Aycliffe and Spennymoor to reflect the two largest communities in the revised seat.

[3] Sedgefield was first created under the Representation of the People Act 1918 for the 1918 general election, comprising primarily southern parts of the abolished South Eastern Division of Durham, including the communities of Segefield and Billingham.

The 2023 review of Westminster constituencies recommended that all wards in the Borough of Darlington should be removed from the seat, with Shildon moving in from Bishop Auckland and Coxhoe from City of Durham.

[10] At the by-election on 19 July 2007, the official Labour Party candidate Phil Wilson was elected on a reduced majority which in national terms is safe instead of marginal.

Sedgefield has a long mining history (extracting coal, fluorspar and iron ore) and once had a very strong affiliation to the Labour Party, with nearly monolithic support in parts of the constituency.