Stockwell is a London Underground station in Stockwell in the London Borough of Lambeth. It is located on the Northern line between Oval and Clapham North stations, and on the Victoria line between Brixton and Vauxhall stations. It is in Travelcard Zone 2.The station opened on 4 November 1890 as the southern terminus of the City and South London Railway, the first successful deep-level tube in London. The Victoria interchange opened on 23 July 1971 when that line was extended south from Victoria towards Brixton. The station is known for its World War II air-raid shelters, and for being the location of the shooting of Jean Charles de Menezes.

The City and South London Railway (C&SLR) was the first successful deep-level underground "tube" railway in the world, and the first major railway to use electric traction. The railway was originally intended for cable-hauled trains, but owing to the bankruptcy of the cable contractor during construction, a system of electric traction using electric locomotives—an experimental technology at the time—was chosen instead.

When opened in 1890, the line had six stations and ran for 3.2 miles (5.1 km) in a pair of tunnels between the City of London and Stockwell, passing under the River Thames. The diameter of the tunnels restricted the size of the trains, and the small carriages with their high-backed seating were nicknamed padded cells. The railway was extended several times north and south, eventually serving 22 stations over a distance of 13.5 miles (21.7 km) from Camden Town in north London to Morden in south London.Although the C&SLR was well used, low ticket prices and the construction cost of the extensions placed a strain on the company's finances. In 1913, the C&SLR became part of the Underground Group of railways and, in the 1920s, it underwent major reconstruction works before its merger with another of the Group's railways, the Charing Cross, Euston and Hampstead Railway, forming a single London Underground line called the Morden-Edgware line. In 1933, the C&SLR and the rest of the Underground Group was taken into public ownership. Today, its tunnels and stations form the Bank Branch of the Northern line from Camden Town to Kennington and the southern leg of the line from Kennington to Morden.