The leader of the House of Lords is a member of the Cabinet of the United Kingdom who is responsible for arranging government business in the House of Lords. The post is also the leader of the governing party in the House of Lords who acts as the government party chairperson in the house. The role is always held in combination with a formal Cabinet position, usually one of the sinecure offices of Lord President of the Council, Lord Keeper of the Privy Seal or Chancellor of the Duchy of Lancaster. Unless the Leader is also a departmental minister, being Leader constitutes the bulk of their government responsibilities, but it has never been an independent salaried office. The Office of the Leader of the House of Lords is a ministerial department.

The Office of the Leader of the House of Lords (OLHL) is a ministerial department of the Cabinet Office with the duty of providing support to the Leader of the House of Lords, currently Lord True. Duties include assisting the leader in providing information, as well as answering questions from members of the House of Lords and the British Government.