Westmorland was a constituency covering the county of Westmorland in the North of England, which returned Members of Parliament to the House of Commons of the Parliament of the United Kingdom.

In the boundary changes in 1983 the southern part of the constituency became part of the new seat of Westmorland and Lonsdale and the northern area was transferred to Penrith and The Border The 1918 – 1983 seat corresponded to the county of Westmorland even after the abolition of the administrative county in 1974.

Election results taken from the History of Parliament Trust series.

Taylour succeeded to the peerage, becoming Marquess of Headfort and causing a by-election at which his son was elected unopposed.

The political parties had been making preparations for an election to take place from 1939 and by the end of this year, the following candidates had been selected;