The Chancellor of the Exchequer, often abbreviated to Chancellor, is a senior minister of the Crown within His Majesty's Government, and head of His Majesty's Treasury. As one of the four Great Offices of State, the chancellor is a high-ranking member of the British Cabinet.

His Majesty's Treasury, occasionally referred to as the Exchequer, or more informally the Treasury, is a ministerial department of the Government of the United Kingdom. It is responsible for developing and executing the government's public finance policy and economic policy. The Treasury maintains the Online System for Central Accounting and Reporting, the replacement for the Combined Online Information System, which itemises departmental spending under thousands of category headings, and from which the Whole of Government Accounts annual financial statements are produced.