Carshalton is a town, with a historic village center, in south London, England, within the London Borough of Sutton. It is situated 9.5 miles (15.3 km) south-southwest of Charing Cross, in the valley of the River Wandle, one of the sources of which is Carshalton Ponds in the middle of the village. Prior to the creation of Greater London in 1965, Carshalton was in the administrative county of Surrey.

Carshalton consists of a number of neighborhoods. The main focal point, Carshalton Village, is visually scenic and picturesque. At its center it has two adjoining ponds, which are overlooked by the Grade II listed All Saints Church on the south side and the Victorian Grove Park on the north side. The Grade II listed Honeywood Museum sits on the west side, a few yards from the water. There are a number of other listed buildings, as well as three conservation areas, including one in the village. In addition to Honeywood Museum, there are several other cultural features in Carshalton, including the Charles Cryer Theatre and an art gallery in Oaks Park. It is also home to the Sutton Ecology Centre, and every year an environmental fair is held in Carshalton Park to the south of the village.

Carshalton is part of the Carshalton and Wallington parliamentary constituency formed in 1983. Tom Brake (Liberal Democrat) was its MP from 1997 to 2019. As of 2019, Elliot Colburn (Conservative) is the current MP.

The combined population of the five wards comprising Carshalton was 45,525 at the 2001 census. A majority of the population of Carshalton is in the ABC1 social group. In the 2011 Census the wards had been merged into 3 with a total population of 29,917.