The Lord Mayor of London is the mayor of the City of London, England, and the leader of the City of London Corporation. Within the City, the Lord Mayor is accorded precedence over all individuals except the sovereign and retains various traditional powers, rights, and privileges, including the title and style The Right Honourable Lord Mayor of London.

The City of London, widely referred to simply as the City, is a city, ceremonial county and local government district that contains the ancient centre, and constitutes, along with Canary Wharf, the primary central business district (CBD) of London and one of the leading financial centres of the world. It constituted most of London from its settlement by the Romans in the 1st century AD to the Middle Ages, but the modern area referred to as London has since grown far beyond the City of London boundary. The City is now only a small part of the metropolis of Greater London, though it remains a notable part of central London. The City of London is not one of the London boroughs, a status reserved for the other 32 districts. It is also a separate ceremonial county, being an enclave surrounded by Greater London, and is the smallest ceremonial county in England.