Olivia J. Thirlby (New York, 6 oktober 1986) is een Amerikaans actrice die haar filmdebuut maakte in United 93 (2006).

Filmografie 
United 93 (2006) - Nicole Carol Miller
Unlocked (2006) - Abby
Snow Angels (2007) - Lila Raybern
Juno (2007) - Leah
Love Comes Lately (2007) - Sylvia
The Secret (2007) - Samantha Marris
The Wackness (2008) - Stephanie
The Dancer Man (2008) - Anne
Eve (2008) - Kate
Uncertainty (2008) - Sophie
New York, I Love You (2008) - Brett Ratner
Breaking Upwards (2009) - Erika
Arlen Faber (2009) - ...
What Goes Up (2009) - Tess Sullivan
Margaret (2011) - Monica
No Strings Attached (2011) - Katie Kurtzman
The Darkest Hour (2011) -  Natalie
Dredd (2012) - Judge Anderson
Red Knot (2014) - Chloe Harrison
Just Before I Go (2014) - Greta
5 to 7 (2014) - Jane
The Wedding Ringer (2015) - Alison Palmer
The Stanford Prison Experiment (2015) - Christina Zimbardo
Above the Shadows (2019) - Holly
Oppenheimer (2023) - Lilli Hornig

Amerikaans acteur