First Secretary of State is an office that is sometimes held by a minister of the Crown in the Government of the United Kingdom. The office indicates seniority, including over all other secretaries of state. The office is not always in use, so there have sometimes been extended gaps between successive holders.

Dominic Rennie Raab is a British Conservative Party politician who has been Member of Parliament (MP) for Esher and Walton since 2010. From 2019 to 2023, with a brief period out of office during the Truss premiership, Raab was deputy to prime ministers Boris Johnson and Rishi Sunak – as First Secretary of State until 2021 then as Deputy Prime Minister of the United Kingdom until 2023. Additionally he has served in the cabinet positions of Brexit Secretary, Foreign Secretary, Justice Secretary and Lord Chancellor.