The Lord Privy Seal is the fifth of the Great Officers of State in the United Kingdom, ranking beneath the Lord President of the Council and above the Lord Great Chamberlain. Originally, its holder was responsible for the monarch's personal (privy) seal until the use of such a seal became obsolete. Though one of the oldest offices in European governments, it has no particular function today because the use of a privy seal has been obsolete for centuries; it may be regarded as a traditional sinecure, but today, the holder of the office is invariably given a seat in the Cabinet of the United Kingdom, and is sometimes referred to as a minister without portfolio.

In the United Kingdom, the Great Officers of State are traditional ministers of the Crown who either inherit their positions or are appointed to exercise certain largely ceremonial functions or to operate as members of the government. Separate Great Officers exist for England and Wales, Scotland, and formerly for Ireland, though some exist for Great Britain and the United Kingdom as a whole.