- Freemasons Hall in Great Queen Street, London, is the world headquarters of the United Grand Lodge of Ancient Free and Accepted Masons of England. This is usually abbreviated to UGLE or to Grand Lodge. It is also the home of the Metropolitan Grand Lodge of London (MetGL), which oversees more than 1500 Lodges, with some 44,000 members. There are also about 600 Royal Arch Chapters administered by the same staff.
- UGLE, under the leadership of the Most Worshipful The Grand Master, HRH the Duke of Kent, is the supreme Masonic authority for all Lodges under the English Constitution, both in the UK and in Districts and Territories overseas. In England and Wales, most of these Lodges are administered by the Provincial Grand Lodge of the area in which they are located. London is a Metropolitan area and not a Province, and is much larger in purely numerical terms, but administratively it shares many of the same characteristics. Metropolitan Grand Lodge is governed by the Right Worshipful Metropolitan Grand Master, appointed by the Grand Master.
- Metropolitan Grand Lodge was inaugurated by the Grand Master on 1 October 2003 in an Inauguration ceremony at the Royal Albert Hall. Prior to that date, Freemasonry in London had been administered by London Management, which was a semi-autonomous body within UGLE.