Seán M. Cullen (born in 1965) is a Canadian award-winning comedian, actor, author, and screenwriter, known for The Willoughbys (2019), Cloudy with a Chance of Meatballs (2017-2018), Phil the Alien (2004), and The Seán Cullen Show (2003). He has performed stand up internationally, and has several Just For Laughs specials to his name. He is also known for providing voices of characters in shows like Best Ed, Seven Little Monsters, and Almost Naked Animals.

He is a triple Gemini and Canadian Comedy Award winner.