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The London Borough of Harrow is a London borough of north-west London, England. It borders Hertfordshire to the north and other London boroughs: Hillingdon to the west, Ealing to the south, Brent to the south-east and Barnet to the east. The local authority is Harrow London Borough Council.

Harrow is the largest town or district in northwest London. It is a suburban area and is situated 10.5 miles (16.9 km) northwest of Charing Cross. Harrow has a large town centre boasting two shopping centres, plenty of shops throughout Station Road and College Road, over 300 m of a fully pedestranised road consisting of shops (north side of St Ann's), a tube and rail station and 17 bus routes including a bus station.

Harrow should not be confused with Harrow on the Hill, which is a different area south from Harrow. It should also not be confused with Wealdstone (due to Harrow & Wealdstone station's name), which is a district north from Harrow; and Harrow Weald, which is another district north from Wealdstone.

Harrow is located within the Greenhill ward.