Baron St Oswald, of Nostell in the West Riding of the County of York, 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 son, the second Baron, represented Pontefract in the House of Commons. 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 2010 the title is held by the latter's nephew, the sixth Baron, who succeeded his father in 1999.