This article gives an overview of liberalism in the United Kingdom. It is limited to liberal parties with substantial support, mainly proved by having had a representation in parliament. The sign ⇒ denotes another party in that scheme. For inclusion in this scheme, it is not necessary that parties labelled themselves as a liberal party.
In the United Kingdom, the word liberalism can have any of several meanings. Scholars use the term to refer to classical liberalism; the term also can mean economic liberalism, social liberalism or political liberalism; it can simply refer to the politics of the Liberal Democrat party; it can occasionally have the imported American meaning, including the derogatory usage by (American) conservatives. However, the derogatory connotation is much weaker in the UK than in the US, and social liberals from both the left and right wing continue to use liberal and illiberal to describe themselves and their opponents, respectively.
Historically, the term referred to the broad liberal political alliance of the nineteenth century, formed by Whigs, Peelites, and radicals. This alliance, which developed into the Liberal Party, dominated politics for much of the reign of Queen Victoria and during the years before the First World War.
British liberalism is now organised mainly in the social liberalism of the Liberal Democrats (member LI, ELDR). The Alliance Party of Northern Ireland (member LI, ELDR) is their counterpart in Northern Ireland.