The Deputy Leader of His Majesty’s Most Loyal Opposition, or more commonly known as Deputy Leader of the Opposition, is a position in the United Kingdom's Shadow Cabinet. From 2005 to 2010, the office was known as Senior Member of the Shadow Cabinet, and from 2015 to 2023, the office was known as Shadow First Secretary of State. From 2010 to 2015 and again from 2023 to 2024, the office was known as Shadow Deputy Prime Minister.
Even though the role has no specific responsibilities attached to it, the holder of the position shadows the First Secretary of State and/or Deputy Prime Minister of the United Kingdom and deputises for the Leader of the Opposition in Prime Minister's Questions when the First Secretary or Deputy PM is deputising for the Prime Minister.
The position remained vacant from 5 November 2024 until 1 September 2026, when Alex Burghart was appointed to the position by Kemi Badenoch.