Coordinates: 51°31′04″N 0°08′49″W / 51.5177°N 0.1470°W / 51.5177; -0.1470

Marylebone (ⁱ/ˈmɑrlɨbən/ MAR-li-bən)^{[citation needed]} is an affluent inner-city area of central London, located within the City of Westminster. It is sometimes written as St. Marylebone or Mary-le-bone.

Marylebone is in an area of London that can be roughly defined as bounded by Oxford Street to the south, Marylebone Road to the north, Edgware Road to the west and Great Portland Street to the east. A broader definition designates the historic area as Marylebone Village and encompasses neighbouring Regent's Park, Baker Street and the area immediately north of Marylebone Road, containing Marylebone Station, the original site of the Marylebone Cricket Club at Dorset Square, and the neighbourhood known as Lisson Grove to the border with St John's Wood. The west side of the Fitzrovia area up to Cleveland Street was also previously considered to be part of Marylebone.

Today the area is host to many medical and dental offices, traditionally concentrated in Harley Street. Since the opening of the Jubilee Line at Baker Street station (with its direct links to Canary Wharf), Marylebone – particularly Marylebone Village – has become an even more sought-after area in central London.