Dawn Olivieri (born February 8, 1981) is an American actress perhaps best known for her turn as Lydia in Heroes and Monica Talbot in House of Lies.

She has appeared in the Showtime series House of Lies for 41 episodes, starting in 2012, playing the competitive management consultant and ex-wife of main character Marty Kaan and mother of their son, Roscoe Kaan. She acted as Janice Herveaux in the third season of the HBO series True Blood. She played a reporter and Damon Salvatore's girlfriend Andie Star in the hit CW show The Vampire Diaries. Wrapping up the 4th season on Heroes, she has also completed parts on TBS's My Boys, NBC's Knight Rider, TNT's Trust Me, and SyFy's Stargate: Atlantis, and recurred on CBS's How I Met Your Mother. Olivieri played a lead role in the SyFy movie Hydra, and she is the voice of Pepper Potts in the new Avengers animated series on Disney XD. She appeared in the October 2009 issue of Maxim. Olivieri appeared on HBO's Entourage on September 13, 2009, and hosted a contest on Scripped. She voiced Lucy Kuo in a PlayStation 3 video game, inFamous 2, which was released in June 2011.

As of March 2018, she has a recurring role on SEAL Team as Amy Nelson.

Dawn Olivieri ist eine US-amerikanische Schauspielerin, die vor allem durch ihre Serienrollen bekannt geworden ist.

Dawn Olivieris erster Auftritt war 2004 in einer Folge der Reality-Sendung The Player. Seit 2005 ist sie hauptsächlich in Fernsehserien zu sehen, so trat sie in Einzelfolgen verschiedener Serien wie CSI: Den Tätern auf der Spur oder Veronica Mars auf. Ab 2009 war Olivieri in der vierten Staffel der Fernsehserie Heroes als Lydia zu sehen. Seit 2012 ist Olivieri in der Showtime-Serie House of Lies in der Hauptrolle der Monica Talbot zu sehen.

Vereinzelt spielt sie auch in Filmen wie dem Fernsehfilm Hydra: The Lost Island oder dem mehrfach Oscar-nominierten Film American Hustle (2013), in dem sie eine kleinere Nebenrolle hatte.