William Edgcumbe, Viscount Valletort

William Richard Edgcumbe, Viscount Valletort (19 November 1794 – 29 October 1818), was a British politician.

Valletort was the eldest son of Richard Edgcumbe, 2nd Earl of Mount Edgcumbe, and Lady Sophia, daughter of John Hobart, 2nd Earl of Buckinghamshire.

Valletort was elected Member of Parliament for Lostwithiel in 1816, a seat he held until 1818. He unsuccessfully contested Fowey in June 1818. However, in March 1819, four months after his death, he was successfully returned on petition.

Lord Valletort died unmarried in October 1818, aged 23, predeceasing his father. His younger brother Ernest later succeeded in the earldom.