An urban district in the Brentford parliamentary division of Middlesex, England, suburban to London, 12 m. W. of St Paul's Cathedral, on the Great Western railway. Pop. (1891), 7896; (1901), 13,200. Brickfields, flour-mills and chemical works are established in the district, which is also largely residential. The Grand Junction Canal serves Southall. Cattle markets are held weekly under a grant of William III. The Elizabethan manor-house of Southall remains, and the parish church of Norwood, though greatly restored, has Early English and Decorated portions, a canopied tomb dated 1547 and brasses of the 17th century.