Coordinates: 51°35′02″N 0°20′01″W / 51.583971°N 0.333645°W / 51.583971; -0.333645
Greenhill is a locality within the London Borough of Harrow. It is located to the north of Harrow Hill in Greater London. It also describes an ecclesiastical parish and ward with similar but not identical boundaries.
The parish church (dedicated to St John the Baptist) is at the junction of Station Road and Sheepcote Road. The parish war memorial is outside the church.
The 2001 ward boundary is mostly contained to the east by the railway between Kenton station and The Bridge, Wealdstone; from there to Lower Mead (including Tesco/the previous location of Wealdstone Football Club); from there westward along Hindes Road to the junction with Roxborough Road; from there to the roundabouts above the Underground railway at the West end of College Road; from there along Bessborough Road to the NW corner of the cricket ground opposite Whitmore Road; from there along the footpath leading toward St Mary's church to where it meets the footpath continuing from Roxborough Park; from there to the Southern end of (the road named) Roxborough Park; from there to the SE corner of The Grove Open Space; from there to the junction of Lowlands Road and Tyburn Lane; from there along Tyburn Lane and Kenton Road to Kenton Station.