HMG is an acronym for Her Majesty's Government of the United Kingdom of Great Britain and Northern Ireland.

It is the full name of the British Government and is often used by members of the government and their advisers as a convenient short label to describe British Ministers and the senior civil servants (mandarins) in Departments of the United Kingdom Government. The term comes from the formal constitutional position that British ministers govern the country by advising the Crown through the Privy Council.