Clea Helen D'Etienne DuVall (born September 25, 1977) is an American actress, writer, producer, and director. She is best known for her role as Sofie on the HBO television series Carnivàle (2003–05), and for films such as The Faculty (1998), She's All That (1999), But I'm a Cheerleader (1999), Girl, Interrupted (1999), 21 Grams (2003), and The Grudge (2004). She is also known for her roles as Cora Lijek in the Academy Award–winning film Argo (2012), Audrey Hanson on NBC's Heroes (2006–07), Wendy Peyser on FX's American Horror Story: Asylum (2012–13), and Emma Borden on Lifetime's The Lizzie Borden Chronicles (2015).

Since 2016, she has played Marjorie on HBO's Veep, for which she has twice been nominated"along with her co-stars"for the Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Comedy Series, winning in 2018.