Shadow Deputy Prime Minister of the United Kingdom

The Deputy Prime Minister of the United Kingdom (DPM) is a senior member of the Cabinet of the United Kingdom. The office of the Deputy Prime Minister is not a permanent position, existing only at the discretion of the Prime Minister, who may appoint to other offices – such as First Secretary of State – to give seniority to a particular Cabinet Minister.

Unlike analogous offices in some other nations, such as a vice-presidency, the British deputy prime minister possesses no special constitutional powers as such, though they will always have particular responsibilities in government. They do not assume the duties and powers of the Prime Minister in the latter's absence, illness, or death, such as the powers to seek a dissolution of parliament, appoint peers or brief the sovereign.

The Deputy Prime Minister does not automatically succeed the Prime Minister when the latter is incapacitated, or resigns from the leadership of his or her party. The designation of someone to the role of Deputy Prime Minister may provide additional practical status within the cabinet, enabling exercise of de facto, if not de jure, power.

In a coalition government, such as the 2010–2015 coalition government between the Conservatives and Liberal Democrats, the appointment of the leader of the smaller party (in the 2010 case, Nick Clegg, leader of the Liberal Democrats) as Deputy Prime Minister is done to give that person more authority within the cabinet to enforce the coalition's agreed-upon agenda. The Deputy Prime Minister usually deputises for the Prime Minister at official functions, such as Prime Minister's Questions.

The post of Deputy Prime Minister is not currently in use, having been left empty since the end of the coalition government following the 2015 UK general election.