Kenneth Welsh, CM (March 30, 1942 – May 5, 2022) was a Canadian film and television actor (sometimes credited as Ken Welsh). He was known to Twin Peaks fans as the multi-faceted villain Windom Earle, and had more recently played the father of Katharine Hepburn (Cate Blanchett) in Martin Scorsese's The Aviator.

In 1984 he was nominated for a Genie Award as Best Actor for his portrayal of Reno Colt in the film "Reno and the Doc", written and directed by Charles Dennis. In 1997 Welsh directed Dennis in the latter's play "SoHo Duo" at the West Bank Theatre in New York City.