Spelthorne is a local government district and borough in Surrey, England. It contains the towns and villages of Ashford, Laleham, Shepperton, Staines-upon-Thames, Stanwell and Sunbury-on-Thames.

Boroughs adjacent to Spelthorne are Runnymede and Elmbridge to the south in Surrey, Windsor and Maidenhead and Slough to the west in Berkshire, and Hillingdon, Hounslow and Richmond upon Thames to the north and east in Greater London.