Southall was a constituency from 1945 to 1983. It returned one member (MP) to the House of Commons of the UK Parliament. The Labour Party candidate won the seat at each general election and no by-elections took place. It lay in local terms administratively in Middlesex, but from 1965, in the London Borough of Ealing. After five years it shed roughly its western half to form a new seat, Hayes and Harlington. To compensate it took in Hanwell, and later further eastern additions – parts of Ealing.