Rhys Owain Ifans (born 22 July 1967) is a Welsh actor and musician. He was formerly the frontman of Welsh rock music bands Super Furry Animals and The Peth. As an actor, he is best known for his roles in Notting Hill (1999), Kevin & Perry Go Large (2000), and Enduring Love (2004) as well as his portrayals of Xenophilius Lovegood in Harry Potter and the Deathly Hallows – Part 1 (2010), supervillain Lizard in The Amazing Spider-Man (2012) and Spider-Man: No Way Home (2021), and Grigori Rasputin in The King's Man (2021). Other roles include Hector DeJean in the Epix thriller series Berlin Station, Mycroft Holmes in the CBS series Elementary, and Ser Otto Hightower in the HBO television series House of the Dragon.

He was briefly lead vocalist of the rock band Super Furry Animals before they released any records. Starting in 2007, Ifans has sung with the psychedelic rock band The Peth ("peth" is Welsh for "thing"), featuring Super Furry Animals' Dafydd Ieuan, which played a number of concert dates in south Wales and in London in the autumn of 2008. In 2009, the band supported Oasis at a concert in the Millennium Stadium in Cardiff.