The Shadow Chancellor of the Duchy of Lancaster is a position in the British Shadow Cabinet, appointed by the Leader of the Opposition. The post involves holding the Chancellor of the Duchy of Lancaster to account, who has control over the estates and rents of the Duchy of Lancaster. The position was re-established by Keir Starmer in April 2020, replacing the position of Shadow Lord President of the Council last held by Jon Trickett, which was split from Shadow Leader of the House of Commons by former Labour leader Jeremy Corbyn.

The Official Opposition Shadow Cabinet, or His Majesty’s Most Loyal Opposition Shadow Cabinet, but usually simply the Shadow Cabinet, is the committee of senior members of the Official Opposition who scrutinise the work of the Cabinet of the United Kingdom. Each Shadow Cabinet member is typically given a position which corresponds to that of a government minister in Cabinet. Shadow Cabinet members, known as Shadow Ministers, are usually appointed by the Leader of the Opposition. The roles of Shadow Ministers are to develop alternative policies, hold the government to account for its actions and responses, and act as spokespeople for the opposition party in their own specific policy areas. By convention, Shadow Ministers are drawn either from serving members of the House of Commons or the House of Lords, with most chosen from the former. Since May 2010, Labour has been the Official Opposition, and its leadership therefore forms the current Shadow Cabinet.