Brentwood and Ongar is a constituency represented in the House of Commons of the UK Parliament since 1992 by Eric Pickles, a Conservative.
Created in 1974, the seat has been held by the incumbent, Eric Pickles, since the General Election in 1992. The Liberal Democrats amassed their largest share of the vote in 1992 (including results for their two predecessor parties). At the 2010 election their candidate was second-placed with 13.6% of the vote, ahead of the Labour Party's candidate.
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. Bell failed to gain Brentwood and Ongar from the Conservatives, but cut the Conservative majority to just 6.5%, the lowest in the seat's history.
1974-1983: The Urban District of Brentwood, and in the Rural District of Epping and Ongar the civil parishes of Abbess Beauchamp and Berners Roding, Blackmore, Bobbingworth, Doddinghurst, Fyfield, High Laver, High Ongar, Kelvedon Hatch, Lambourne, Little Laver, Moreton, Navestock, Ongar, Stanford Rivers, Stapleford Abbotts, Stapleford Tawney, Stondon Massey, Theydon Mount, and Willingale.
1983-2010: The District of Brentwood, and the District of Epping Forest wards of Chipping Ongar, Greensted and Marden Ash, High Ongar, Lambourne, Moreton and Matching, Passingford, Roothing Country, and Shelley.
2010-present: The Borough of Brentwood, and the District of Epping Forest wards of Chipping Ongar, Greensted and Marden Ash, High Ongar, Willingale and The Rodings, Lambourne, Moreton and Fyfield, North Weald Bassett, Passingford, and Shelley.