Brentwood and Ongar is a constituency[n 1] in Essex represented in the House of Commons of the UK Parliament since 2017 by Alex Burghart, a Conservative.

In the 2001 election, Pickles was opposed by Martin Bell, who had represented the Tatton constituency in the last Parliament as an independent and had pledged not to seek re-election there.

Following the retirement of Eric Pickles, in the 2017 and 2019 elections it was the Labour Party candidate who emerged as the main challengers to the Conservatives in the seat.

The 2023 periodic review of Westminster constituencies, which was based on the ward structure in place on 1 December 2020, left the boundaries virtually unchanged.

[7] However, following a local government boundary review in Epping Forest which came into effect in May 2024,[8] the constituency now comprises the following from the 2024 general election: Billericay and Chigwell prior to 1974