Under its uncodified constitution, the United Kingdom possesses no formal permanent office of Deputy Prime Minister. Some British Prime Ministers have chosen to designate one of their cabinet colleagues to possess such a role as a form of honorific.

Unlike analogous offices in some other nations, a British Deputy Prime Minister possesses no special powers above those of his ministry and does not possess the theoretical powers of the Prime Minister in the latter's absence or illness, such as the powers to seek a dissolution of parliament, appoint peers or brief the sovereign. In practice, however, the designation of someone to the role of Deputy Prime Minister may give them an additional practical status within cabinet, enabling them to exercise de facto even if not de jure powers.

The current Deputy Prime Minister is Robert Noble-Gordon.