Helen D'Etienne DuVall is an American actress and filmmaker. Her film appearances include The Faculty (1998); But I'm a Cheerleader; Girl, Interrupted ; Ghosts of Mars (2001); Identity; 21 Grams ; The Grudge (2004); Zodiac (2007); and Argo (2012). On television, DuVall starred as Emma Borden in Lizzie Borden Took an Ax (2014) and its miniseries spinoff, The Lizzie Borden Chronicles (2015). Her other credits include Carnivàle (2003–2005), Heroes (2006–2007), American Horror Story (2012–2013), Better Call Saul (2015–2017), Veep (2016–2019), and The Handmaid's Tale (2018–2022). She has voiced Elsa on Fox's HouseBroken, which she co-created, since 2021.

The Faculty is a 1998 American science fiction horror film directed and edited by Robert Rodriguez with a screenplay by Kevin Williamson. It stars Jordana Brewster, Clea DuVall, Laura Harris, Josh Hartnett, Shawn Hatosy, Famke Janssen, Piper Laurie, Bebe Neuwirth, Robert Patrick, Usher Raymond, Jon Stewart, and Elijah Wood.