The Shadow Deputy Prime Minister of the United Kingdom is a position in the United Kingdom's Shadow Cabinet that was created on 6 December 2005 by the then-Leader of the Opposition, David Cameron for his 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 since 2023, the office has been known as Shadow Deputy Prime Minister.