Loudoun Road is a street in the St John's Wood area of London. Most of its route is in the City of Westminster, but it crosses into the London Borough of Camden at its northern end in South Hampstead. It runs roughly parallel to Finchley Road to its east while Abbey Road, London is to the west. It runs north from Grove End Road, not far from St John's Wood tube station, and crosses or is joined by a number of streets including Marlborough Place, Carlton Hill and Boundary Road. It finishes at a roundabout junction with several streets including Belsize Road and Fairhazel Gardens. South Hampstead railway station is at the northern end of the street.