The political secretary to the prime minister of the United Kingdom is a senior official in the United Kingdom Civil Service who advises the prime minister. Established by Harold Wilson, but continued by subsequent prime ministers, the political secretary was originally not a civil servant, but was later incorporated into the Civil Service. The role has not been in use since July 2024. In September 2025, the role of Chief Secretary to the Prime Minister was established, which partly covers this role alongside duties of the Chancellor of the Duchy of Lancaster.