Sean Patrick Hayes (born June 26, 1970) is an American actor, comedian, and producer. Known for his performances on stage and screen, he gained acclaim for his role as Jack McFarland on the NBC sitcom Will & Grace, for which he won a Primetime Emmy Award and four Screen Actors Guild Awards. He has also received nominations for six Golden Globe Awards and two Tony Awards, winning one.

He also runs a television production company called Hazy Mills Productions, which produces shows such as Grimm, Hot in Cleveland, The Soul Man, and Hollywood Game Night. He portrayed Jerry Lewis in the CBS film Martin and Lewis (2002). He is known for his appearances in films such as Billy's Hollywood Screen Kiss (1998), Cats & Dogs (2001), Pieces of April (2003), The Cat in the Hat (2003), Win a Date with Tad Hamilton! (2004), The Bucket List (2007), Igor (2008), The Three Stooges (2012), Monsters University (2013), and Am I OK? (2022). Since July 2020, he has co-hosted the comedy podcast SmartLess alongside Jason Bateman and Will Arnett.