Lewisham West was a borough constituency in south-east London represented in the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first past the post system of election from 1918, until it was abolished for the 2010 general election.

From 1966 until 1992, Lewisham West was a classic bellwether seat, being won by whichever party won the General Election (with the exception of 1979). However, long-term demographic trends have since turned the seat away from being a Labour-Conservative marginal into a safe Labour seat. Partly this has occurred because of a strong increase in the number of ethnic minority residents. At the same time, the communities of Catford, Sydenham and Forest Hill have become much less leafy and suburban over the past 30 years. The large council estate of Bellingham has always been a Labour stronghold, and the other areas of the seat can also now be regarded as quite safe for Labour, whereas in the past they were not.

1918–1950: The Metropolitan Borough of Lewisham wards of Brockley, Forest Hill, and Sydenham, and parts of the wards of Catford and Lewisham Village.

1950–1974: The Metropolitan Borough of Lewisham wards of Brockley, Forest Hill, Honor Oak Park, Sydenham East, and Sydenham West.

1974–1983: The London Borough of Lewisham wards of Bellingham, Culverley, Forest Hill, Honor Oak Park, Rushey Green, Sydenham East, and Sydenham West.

1983–2010: The London Borough of Lewisham wards of Bellingham, Catford, Forest Hill, Horniman, Perry Hill, Rushey Green, St Andrew, Sydenham East, and Sydenham West.

Lewisham West constituency covered the south-western part of the London Borough of Lewisham, being largely based on the communities of Catford, Sydenham, Forest Hill and Bellingham.

• List of parliamentary constituencies in London