Thomas Penn (8 March 1702 – 21 March 1775) was an English landowner and mercer who was the chief proprietor of Pennsylvania from 1746 to 1775. Penn is best known for his involvement in negotiating the Walking Purchase, a contested land cession treaty he negotiated with Lenape chief Lappawinsoe in 1737 which transferred control over 1,200,000 acres (4,860 km2) of territory from the Lenape tribe to the Province of Pennsylvania.