Sir John Vincent Cable is a British politician who was Leader of the Liberal Democrats from 2017 to 2019. He was Member of Parliament (MP) for Twickenham from 1997 to 2015 and from 2017 to 2019. He also served in the Cabinet as Secretary of State for Business, Innovation and Skills from 2010 to 2015.

The Liberal Democrats are a political party in the United Kingdom. Party members elect the leader of the Liberal Democrats, the head and highest-ranking member of the party. Liberal Democrat members of Parliament also elect a deputy leader of the Parliamentary Party in the House of Commons, often colloquially referred to as the deputy leader. Under the federal constitution of the Liberal Democrats the leader is required to be a member of the House of Commons.