Oxford Street is a major thoroughfare in the City of Westminster in the West End of London, England. There are 548 shops on Oxford Street; it is Europe's busiest shopping street, as well as its most dense.

The street was formerly part of the London-Oxford road which began at Newgate, City of London, when it was known as Oxford Road. Today the road forms part of the A40, although, like many roads in central London which are not now intended as through traffic routes, it is not signposted with the road number.
 

It runs for approximately a mile and a half (two and a half kilometres) from Marble Arch at the north east corner of Hyde Park, through Oxford Circus to St Giles Circus, at the intersection with Charing Cross Road and Tottenham Court Road. Eastwards, the road then becomes New Oxford Street until it runs into High Holborn. Oxford Street intersects with other London roads including Park Lane, New Bond Street and Regent Street. West of Marble Arch, Oxford Street becomes Bayswater Road, then Notting Hill Gate and Holland Park Avenue until it becomes the Uxbridge Road at Shepherd's Bush Roundabout. At Uxbridge it becomes the Oxford Road again, all the way to Oxford, save for some short sections where it has been given a local name.
 

At Oxford Circus is the notable diagonal crossing, opened in 2009, the only one of its kind in central London.