Piccadilly is a major street in central London, England, running from Hyde Park Corner in the west to Piccadilly Circus in the east. It is completely within the City of Westminster. The street is part of the A4 road, London's second most important western artery. St James's lies to the south of the eastern section of the street, while the western section is built up only on the northern side and overlooks Green Park. The area to the north is Mayfair.
It is the location of Fortnum & Mason, the Royal Academy, the Ritz Hotel, the RAF Club, Hatchards book shop and the embassies of Japan and Malta. Simpson's, once amongst the United Kingdom's leading clothing stores, opened on Piccadilly in the 1930s. The store closed in 1999 and the site is now the flagship shop of the booksellers Waterstone's.