John (de) Welles, 1st Viscount Welles, KG (c. 1450 – 9 February 1499) was an English Lancastrian nobleman who was made a Knight of the Garter.
John was born about 1450 to Lionel de Welles, 6th Baron Welles and Margaret Beauchamp. He was a maternal half-brother of Margaret Beaufort, and thus an uncle of the half-blood of Henry VII.
John died and was buried in February 1498 in Westminster, England.