HANWELL, urban district of Middlesex, England, Io2 m. W. of St. Paul's cathedral, London. Pop. (1921) 20,481. It is a residential suburb of London. Many of its inhabitants are em ployed in metal industries, in electrical works and in furniture factories. The mental hospital has accommodation for over 2,500 patients. Before the Norman period the manor of Hanwell be longed to Westminster Abbey.