Viscount Hanworth, of Hanworth in the County of Middlesex, is a title in the Peerage of the United Kingdom.^[1]

The title was created on 17 January 1936 for the judge turned Conservative Member of Parliament who achieved the judicial position of Master of the Rolls, Ernest Pollock, 1st Baron Hanworth. He had already been created a Baronet, of Hanworth in the County of Middlesex, on 27 November 1922, in the Baronetage of the United Kingdom,^[2] and Baron Hanworth, of the same territorial designation, on 28 January 1926.^[3] As of 2017^[update] the titles are held by his great-grandson, the third Viscount, who succeeded his father in 1996.

• Ernest Murray Pollock, 1st Baron Hanworth (1861–1936) (created Viscount Hanworth in 1936)

In a poor state of repair the large two-storey brick house was built following a fire in 1797 by the Duke of St Albans. What remained of it was later bought with a few acres of attached lawns and fields by the first Viscount however quickly converted into the London Air Park. The Viscount also transferred his Hanworth Park estate to public benefit in the suburb of Hanworth, London. Its later shape is now a mixture of public grassland and recreational amenities such as sports pitches funded by two local charitable clubs and a leisure centre, built by the London borough.

• Pollock Baronets, of Hatton, and Pollock Baronets, of The Khyber Pass