Llŷr Ifans is a Welsh actor, born in Ruthin, Denbighshire. He is best known for appearing opposite his brother Rhys Ifans in the cult film, "Twin Town", in 1997. In September 2007 Ifans appeared at Clwyd Theatr Cymru in their production of "A Toy Epic", which ran at the Mold venue and then was taken on a short tour around Wales.

He also appeared in the short Welsh-language television drama "S.O.S. Galw Gari Tryfan".

In 2015 Ifans gave "an enjoyably louche performance as the town's resident middle-aged delinquent, Nogood Boyo" in the S4C bilingual remake of Dylan Thomas' "Under Milk Wood" (English version)/"Dan y Wenallt" (Welsh version).