Trafalgar Square is a public square in the City of Westminster, Central London, established in the early 19th century around the area formerly known as Charing Cross. The square's name commemorates the Battle of Trafalgar, the British naval victory in the Napoleonic Wars over France and Spain that took place on 21st October 1805 off the coast of Cape Trafalgar.

The City of Westminster is a city and borough in London. It is the site of the United Kingdom's Houses of Parliament and much of the British government. It occupies a large area of central London, including most of the West End. Many London landmarks are within the borough, including Buckingham Palace, Westminster Abbey, Whitehall, Westminster Cathedral, 10 Downing Street, and Trafalgar Square.