Sir William Esturmy (c. 1356 – 1427)) was a Speaker of the House of Commons, a Knight of the Shire and an hereditary Warden of the royal forest of Savernake Forest. he was the son of Geoffrey Sturmy (died 1381) and nephew and heir of Sir Henry Sturmy of Wolfhall. He inherited in 1381 and was knighted by October 1388. He held the post of hereditary warden of Savernake Forest from 1381 to 1417 and from 1420 until his death in 1427. He served as knight of the shire for Hampshire in 1384 and again in 1390, and also eight times for Wiltshire and twice for Devon between then and 1422. He was elected Speaker of the House of Commons in 1404. He was appointed High Sheriff of Wiltshire for 1418. He held a number of public posts and served several times as an ambassador abroad.