The Chancellor and Under-Treasurer of Her Majesty's Exchequer, commonly known as the Chancellor of the Exchequer, or simply the Chancellor, is a senior official within the Government of the United Kingdom and head of Her Majesty's Treasury. The office is a British Cabinet-level position.
The chancellor is responsible for all economic and financial matters, equivalent to the role of finance minister in other nations. The position is considered one of the four Great Offices of State, and in recent times has come to be the most powerful office in British politics after the prime minister.