Jeremy Bernard Corbyn is a British politician who served as Leader of the Opposition and Leader of the Labour Party from 2015 to 2020. On the political left of the Labour Party, Corbyn describes himself as a socialist. He has been Member of Parliament (MP) for Islington North since 1983. As of October 2020, Corbyn sits in the House of Commons as an independent, following the suspension of the whip.

The Leader of His Majesty's Most Loyal Opposition, more commonly referred to as the Leader of the Opposition, is the person who leads the Official Opposition in the United Kingdom. The position is seen as the shadow head of government of the United Kingdom and thus the shadow prime minister of the United Kingdom.