Daisy Cooper is a British Liberal Democrat politician who has served as the Member of Parliament (MP) for St Albans since 2019. She has served as the Deputy Leader of the Liberal Democrats since 2020, and as the Liberal Democrat spokesperson for Health, Wellbeing and Social Care since 2021.

The office of deputy leader of the Liberal Democrats is a position within the Liberal Democrats, a liberal political party in the United Kingdom. The position of Deputy Leader has never formally existed in the party constitution, however since the party's foundation, the Liberal Democrat parliamentary group in the House of Commons have usually elected a Deputy Leader. Although often referred to as the Deputy Leader of the Liberal Democrats, this post is actually only Deputy Leader of the Liberal Democrat parliamentary group in the House of Commons and not Deputy Leader of the Lib Dems as a whole.