Freemasons' Hall in London is the headquarters of the United Grand Lodge of England and the Supreme Grand Chapter of Royal Arch Masons of England, as well as being a meeting place for many Masonic Lodges in the London area. It is located in Great Queen Street between Holborn and Covent Garden and has been a Masonic meeting place since 1775.

Parts of the building are open to the public daily, and its preserved classic Art Deco style, together with its regular use as a film and television location, have made it a tourist destination.

In 1775 the premier Grand Lodge purchased a house fronting the street, behind which was a garden and a second house. A competition was held for the design of a Grand Hall to link the two houses. The front house was the Freemasons' Tavern, the back house was to become offices and meeting rooms. The winning design was by Thomas Sandby. It was dedicated on 23 May 1776.

An addition was added in 1820 by John Soane, though Soane's addition was demolished in 1860.

In 1846, the World Evangelical Alliance was founded here.

The original building was renovated and extended in 1862 with designs by Frederick Pepys Cockerell, who had drawn them up decades earlier. Weakened by an 1883 fire, the building was partially demolished in 1910.

The current building, the third on this site, was built between 1927 and 1933 in the Art Deco style to the designs of architects Henry Victor Ashley and F. Winton Newman as a memorial to the 3,225 Freemasons who died on active service in World War I.

It is an Art Deco building, covering two and a quarter acres (0.9 ha). Initially known as the Masonic Peace Memorial, the name was changed to Freemasons' Hall at the outbreak of the World War II in 1939. The financing for building the hall was raised by the Masonic Million Memorial Fund. This fund raised over £1 million. It is a Grade II* listed building, both internally and externally.