Violet Stewart Louisa Piercy (24 December 1889 – April 1972) was an English long-distance runner who is recognized by the International Association of Athletics Federations as having set the first women's world best in the marathon on 3 October 1926 with a time of 3:40:22. Piercy was reported to have run unofficially and her mark was set on the Polytechnic Marathon course between Windsor and London.