Basildon and Billericay (/ˈbæzɪldən ... ˈbɪlərɪki/) is a constituency[n 1] in Essex represented in the House of Commons of the UK Parliament.

[n 2] The seat was created for the 2010 general election following a review of the Parliamentary representation of Essex by the Boundary Commission for England.

It has been held throughout its existence by the Conservative Party and, until the 2024 general election, with large majorities.

[4] Following a local government boundary review in Basildon which came into effect in May 2024,[5] the constituency now comprises the following from the 2024 general election: The MP until the dissolution of parliament in May 2024 was the Conservative John Baron, who had held the seat since its creation, but announced in October 2023 that he would be stepping down.

[7] His party's choice of the national chairman as its candidate to succeed him was controversially made just 48 hours before the deadline from a shortlist of one, to the anger of the local association.