51°31′5″N 0°9′33″W / 51.51806°N 0.15917°W
Montagu Square is a garden square in Marylebone, London. It is centred 550 metres north of Marble Arch. It spans 810 feet (250 m) by 150 feet (46 m). and is oriented on an axis of about NNW. Save for No.s 27 to 29 the long sides (NNW-SSE) are Grade II listed residential buildings.
Montagu Place runs along the north end; George Street along the south; both have a crossroads on the western side with Upper Montagu/Montagu Streets, each in turn one block away from retail/service premises fronted streets.