Calder Valley is a constituency in West Yorkshire represented in the House of Commons of the UK Parliament since 2024 by Josh Fenton-Glynn of the Labour Party.

Hebden Bridge and Todmorden are known for their bohemian culture and are more Labour-leaning, whereas Elland and Brighouse tend to vote Conservative,[4] making the seat marginal overall.

1983–2024: Since the constituency's creation in 1983, it comprised the Metropolitan Borough of Calderdale wards of Brighouse, Calder, Elland, Greetland and Stainland, Hipperholme and Lightcliffe, Luddendenfoot, Rastrick, Ryburn, and Todmorden.

2024–present: Same as above apart from the loss of part of the Ryburn ward (polling districts MB, MC and MD) to Halifax in order to bring the electorate within the permitted range as part of the 2023 Periodic Review of Westminster constituencies.

Historically a bellwether seat between Labour and the Conservatives, at the 2010 general election the seat became the closest three-way marginal in the north of England, with less than 1,000 votes between the Labour candidate in second place and the Liberal Democrat candidate in third, although with a significant Conservative majority.