William Fanshawe (1583 – 4 March 1634) was an English politician who sat in the House of Commons between 1614 and 1625.
Fanshawe was the second son of Thomas Fanshawe, of Ware Park, Hertfordshire and his second wife Joan Smyth, the daughter of Thomas "Customer" Smythe, of Ostenhanger.
[3] The manor would remain in the Fanshawe family for the next 300 years.
In 1614 he was elected Member of Parliament for Lancaster and entered the East India Company.
In 1619, he acquired the manor of Parsloes, Essex, which was held by his descendants until 1917.