South West Cambridgeshire is a former United Kingdom Parliamentary constituency.

The seat was created for the 1983 general election which followed on from the merger under the Local Government Act 1972, of the two administrative counties of Huntingdon and Peterborough and Cambridgeshire and Isle of Ely to form the non-metropolitan county of Cambridgeshire, with effect from 1 April 1974.

The constituency combined territory from three pre-1974 local authorities: the south west part of the abolished administrative county of Cambridgeshire; the south of Huntingdonshire, including St Neots; and two wards from Cambridge.

The seat was abolished for the 1997 general election, as western parts, comprising the area formerly in Huntingdonshire was transferred to the Huntingdon constituency.

Remaining, southern parts formed the bulk of the new County Constituency of South Cambridgeshire.