Eastleigh is a constituency[n 1] represented in the House of Commons of the UK Parliament since 2024 by Liz Jarvis, a Liberal Democrat.

The seat forms part of the South Hampshire conurbation between Southampton and Portsmouth, including the railway town of Eastleigh itself.

It was a fairly safe seat for the Conservatives for nearly forty years until the death of its then MP, former journalist Stephen Milligan, in 1994.

At the subsequent by-election, the Liberal Democrats gained the seat on a very large swing, and then held Eastleigh in the four following general elections (1997, 2001, 2005 and 2010), though with somewhat narrow majorities.

Following the 2010 general election, Huhne joined the coalition government's cabinet as Secretary of State for Energy and Climate Change, but resigned as an MP in February 2013 after admitting perverting the course of justice over a speeding case.