Westmorland and Lonsdale is a constituency[n 1] in the south of Cumbria, represented in the House of Commons of the UK Parliament since 2005 by Tim Farron, the former leader of the Liberal Democrats (2015–2017).

To partly offset this, the former District of South Lakeland wards of Arnside & Milnthorpe, Burton & Crooklands, and Sedbergh & Kirkby Lonsdale were included in Morecambe and Lunesdale, thereby making the latter a cross-county boundary constituency.

In 2005, the constituency featured among a list of seats held by high-profile Conservatives (in this case Shadow Education Secretary Tim Collins) targeted by the Liberal Democrats by deploying supporters from across each region in what was referred in the media as a "decapitation strategy".

By many measures — the total votes cast, the size of the majority, and the margin of victory — this was the Liberal Democrats' strongest result nationwide.

[14][15] In 2019, Westmorland and Lonsdale was one of five English constituencies, the others being Esher and Walton, East Devon, Cheltenham and Winchester, where Labour failed to obtain over 5% of the vote and lost their deposit.