Marginal constituencies in the 2005 United Kingdom general election

This is a list of marginal seats in the United Kingdom after the results in the 2005 General Election. At the 2010 General Election, boundary changes under the Fifth Periodic Review of Westminster constituencies applied affecting some of these seats.

Conservative – Liberal Democrat marginals
Constituencies where the Conservative Party held a marginal lead over the Liberal Democrats:

Labour – Liberal Democrat marginals
Constituencies where the Labour Party held a marginal lead over the Liberal Democrats:

Labour – Conservative marginals
Constituencies where the Labour Party held a marginal lead over the Conservative Party: