Finchley (/ˈfɪntʃli/) is a large district of north London, England, in the London Borough of Barnet. 7 mi (11 km) north of Charing Cross, nearby districts include: Golders Green, Muswell Hill, Friern Barnet, Whetstone, Mill Hill and Hendon.

It is predominantly a residential suburb, with three town centres: North Finchley, East Finchley and Finchley Church End (Finchley Central). Made up of four wards, the population of Finchley was 65,812 as of 2011.

Finchley probably means "Finch's clearing" or "finches' clearing" in late Anglo-Saxon; the name was first recorded in the early 13th century. Finchley is not recorded in Domesday Book, but by the 11th century its lands were held by the Bishop of London. In the early medieval period the area was sparsely populated woodland, whose inhabitants supplied pigs and fuel to London.

Extensive cultivation began about the time of the Norman conquest. By the 15th and 16th centuries the woods on the eastern side of the parish had been cleared to form Finchley Common. The medieval Great North Road, which ran through the common, was notorious for highwaymen until the early 19th century.

St Mary-at-Finchley Church is first recorded in the 1270s. Near the northern gate to the Bishop of London's park, the hamlet of East End, later East Finchley, had begun to develop by 1365. By the 18th century Finchley was well known for the quality of its hay, which was the dominant agricultural activity until the second half of the 19th century. North Finchley only began to develop after the enclosure of the common during the 1820s.^{[citation needed]}

It formed an ancient parish in the county of Middlesex, originally within the hundred of Ossulstone and later becoming its own urban district, which was then incorporated as a municipal borough in 1933. It has been part of Greater London since 1965.

The Edgware, Highgate and London Railway (later the Great Northern Railway) reached Finchley in 1867. It ran from Finsbury Park via Finchley to Edgware. The branch from Finchley to High Barnet opened in 1872. In 1905 tram services were established in Finchley, and extended shortly afterwards to Barnet. They were eventually replaced by trolleybuses.

In 1933, the Underground New Works Programme (1935–1940), to electrify the lines through Finchley, and connect the Northern line from Archway to East Finchley, via a new tunnel was announced. Much of the work was carried out and East Finchley station was rebuilt, but the project was halted by the second world war. All passenger services from Finchley to Edgware ended in September 1939. Nevertheless, Underground trains began running from central London to High Barnet in 1940, and to Mill Hill East, to reach the army barracks, in 1941.