Baron St Oswald, of Nostell in the West Riding of the County of York,[2] is a title in the Peerage of the United Kingdom.

It was created in 1885 for the industrialist and Conservative politician Rowland Winn, a former Member of Parliament for North Lincolnshire.

His grandson, the fourth Baron, held junior ministerial positions in the Conservative administrations of Harold Macmillan and Alec Douglas-Home and also sat as a Member of the European Parliament.

As of 2017[update] the title is held by the latter's nephew, the sixth Baron, who succeeded his father in 1999.

The house was handed over to the National Trust in 1953 but is still the home of the Barons St Oswald.