The House of Commons is the lower house of the Parliament of the United Kingdom, which also comprises the Sovereign and the House of Lords (the upper house). Both Commons and Lords meet in the Palace of Westminster. The Commons is a democratically elected body, consisting of 650 members (since the 2010 general election), who are known as Members of Parliament (MPs). Members are elected through the first-past-the-post system by electoral districts known as constituencies. They hold their seats until Parliament is dissolved (a maximum of five years after the preceding election).

A House of Commons of England evolved at some point in England during the 14th century and, in practice, has been in continuous existence since, becoming the House of Commons of Great Britain after the political union with Scotland, and also, during the nineteenth century, of the United Kingdom of Great Britain and Ireland after the political union with Ireland, finally reaching its current title after independence was given to the Irish Free State in 1922.