Ieuan Rhys Williams (27 October 1909 – 1973) was a Welsh film, radio and television actor.

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He appeared in Fo a Fe, a Welsh sitcom, as Sioni the bartender; the television series Moulded in Earth (1965) as regular cast member John Ellis; and the drama film Under Milk Wood (1972) with the minor role of Gomer Owens.

He starred in a number of Welsh-language films, including Noson Lawen (1949).

• Lists of actors
• List of Welsh people