Peter Richard Legh, 4th Baron Newton (6 April 1915 – 16 June 1992), was a British Conservative politician who held junior ministerial positions during the 1950s and 1960s. Newton was the son of Richard Legh, 3rd Baron Newton and Helen Winifred Meysey-Thompson, daughter of Henry Meysey-Thompson, 1st Baron Knaresborough. His grandfather Thomas Wodehouse Legh, 2nd Baron Newton was also a Conservative politician and served as Paymaster-General during the First World War.