This is a list of marginal seats in the United Kingdom after the results in the 2005 United Kingdom general election, 2005 General Election. At the 2010 United Kingdom general election, next General Election, boundary changes applied affecting some of these seats.

Labour – Liberal Democrat marginals

Constituencies where the Labour Party (UK), Labour Party holds a marginal lead over the Liberal Democrats (UK), Liberal Democrats:

Labour – Conservative marginals

Constituencies where the Labour Party holds a marginal lead over the Conservative Party (UK), Conservative Party: {{United Kingdom general election, 2005A 2005 United Kingdom general election Lists of marginal seats in the United Kingdom by election