Thornton ward is an administrative division of the London Borough of Lambeth, United Kingdom.
The ward comprises the communities of Clapham Park and the Hyde Farm Estate. The ward shares the borough's western boundary with Wandsworth along Cavendish Road and Emmanuel Road alongside Tooting Bec Common. The south eastern boundary then continues along Emmanuel Road and New Park Road to the A205 South Circular Road. The boundaries of northern part of the ward follow the boundaries of the Clapham Park estate east of Kings Avenue and then cross to run down Clarence Avenue and Poynders Road.
The ward is located in the Streatham parliamentary constituency.
At the Lambeth Council elections, 2010 residents of Thornton ward elected three Labour Party Councillors.