Sir William Esturmy (died 1427[1]) (alias Sturmy), of Wolfhall, Wiltshire was an English Knight of the Shire, Speaker of the House of Commons, and hereditary Warden of the royal forest of Savernake, Wiltshire.
He held the post of hereditary warden of Savernake Forest from 1381 to 1417 and from 1420 until his death in 1427.
Between 1384 and 1422 he served as knight of the shire eight times for Wiltshire, twice for Hampshire (1384 and 1390) and twice for Devon (1391 and 1404).
He held a number of public commissions and served several times as an ambassador abroad.
He married Joan Crawthorne, the widow of Sir John Beaumont of Shirwell and Saunton in North Devon, by whom he had no sons, only two daughters and co-heiresses including: He died at Elvetham in 1427 and was buried at Easton Priory near Wolfhall.