Brentford and Chiswick was aconstituency^{[n 1]}1918 –1974 centred on theBrentford andChiswick districts ofMiddlesex which became parts of west London in 1965. It returned one member (MP) to theHouse of Commons of theUK Parliament.

Its electoral outcomes wereConservative except for siding with theLabour Party's victories which returned theAttlee Ministry (in 1945) andSecond Wilson Ministry (in 1966).

This former constituency is toward the south-west of the historic county ofMiddlesex, in what is since 1965 west London. It was established as a division of the county of Middlesex, named after the towns ofBrentford andChiswick. In the 1885–1918 distribution of parliamentary seats it had been the eastern part of theBrentford division.

In 1918 the constituency comprised the Brentford and the Chiswick Urban Districts. In 1927 the two districts were combined to form a single Brentford and Chiswick Urban District, which in 1932 became theMunicipal Borough of Brentford and Chiswick. In 1950 the boundaries of the seat were left unchanged, but it was reclassified as aborough constituency.

In 1965 Brentford and Chiswick became part of theLondon Borough of Hounslow andGreater London.

The seat rapidly became under-sized in electorate, seemalapportionment – the area forming the seat was unusually declining in population, with in the 1918 to 1930 period the major loss of servants and lodgers among many of the larger houses particularly in Chiswick, and areas of reduction of overly dense housing in Brentford. Little space remained in the seat for new building compared with other seats to the west and north. The rest of the county saw major population growth. One key area of growth in this seat was instead in the number of commercial plants, yards and offices adjoining the'Golden Mile', Brentford.^[1]

In the redistribution of parliamentary seats, which took effect at theFebruary 1974 general election, this seat was replaced byBrentford and Isleworth which took in the eastern half of abolishedHeston and Isleworth.

• Boundaries of Parliamentary Constituencies 1885–1972, compiled and edited by F.W.S. Craig (Parliamentary Reference Publications 1972)
• Leigh Rayment's Historical List of MPs – Constituencies beginning with "B" (part 5)

• History of the London Borough of Hounslow
• Parliamentary constituencies in London (historic)
• Constituencies of the Parliament of the United Kingdom established in 1918
• Constituencies of the Parliament of the United Kingdom disestablished in 1974
• Politics of the London Borough of Hounslow
• Brentford, London
• Chiswick
• 1918 establishments in England
• 1974 disestablishments in England

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