Greenwell Street, formerly Buckingham Street, is located in the East Marylebone district of the City of Westminster in London. It was built in the late eighteenth century and runs between Bolsover Street in the east and Cleveland Street in the west. Great Titchfield Street joins it on its south side. On the south side is the grade II listed George and Dragon public house (c.1850) and the site of the home of the sculptor John Flaxman, the location of which is marked by a plaque.
There are also plaques to the chemist William Hyde Wollaston who worked on platinum in his laboratory there, and from the former buildings of the Royal National Orthopaedic Hospital whose outpatient assessment centre is located in a new building on the north side on the corner with Bolsover Street. The plasterer and scagliola manufacturer Vincent Bellman and his successors in trade had their business at number 14 from 1832 until 1877 where at one stage they employed 68 men and boys. The street was badly damaged by German bombing during the Second World War and has been subject to redevelopment in the post-war period so that, apart from the pub, all of its buildings are of modern construction.