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Olivia Jo Thirlby (born October 6, 1986) is an American actress. She is best known for her roles as Leah in the comedy-drama film Juno (2007), as Natalie in The Darkest Hour (2011) and as Judge Cassandra Anderson in Dredd (2012). In 2023, Thirlby portrayed Lilli Hornig in Christopher Nolan's biographical film Oppenheimer.
| Year | Title | Role | Notes |
| 2006 | United 93 | Nicole Carol Miller | |
| 2007 | Snow Angels | Lila Raybern | |
| Juno | Leah | ||
| Love Comes Lately | Sylvia Brokeles | ||
| The Secret | Samantha Marris | ||
| 2008 | The Wackness | Stephanie Squires | |
| New York, I Love You | Actress | Segment: "Brett Ratner" | |
| 2009 | The Answer Man | Anne | |
| Uncertainty | Sophie Montero | ||
| Breaking Upwards | Erika | ||
| What Goes Up | Tess Sullivan | ||
| Solitary Man | Maureen | Uncredited | |
| 2011 | No Strings Attached | Katie Kurtzman | |
| Margaret | Monica Sloane | ||
| The Darkest Hour | Natalie | ||
| 2012 | Nobody Walks | Martine | |
| Being Flynn | Denise | ||
| Dredd | Judge Anderson | ||
| 2014 | Red Knot | Chloe Harrison | |
| 5 to 7 | Jane Hastings | ||
| Just Before I Go | Greta | ||
| 2015 | The Wedding Ringer | Alison Palmer | |
| The Stanford Prison Experiment | Christina Maslach | ||
| Welcome to Happiness | Trudy | ||
| 2016 | Between Us | Dianne | |
| 2017 | Chappaquiddick | Rachel Schiff | |
| 2018 | Damascus Cover | Kim Johnson | |
| The White Orchid | Claire | Associate producer | |
| 2019 | Above the Shadows | Holly | |
| 2023 | Oppenheimer | Lilli Hornig | |
| Dumb Money | Yaara Plotkin | ||
| Lousy Carter | Candela | ||
| 2026 | Archangel † | TBA | Post-production |
| Year | Title | Role | Notes |
| 2006–2007 | Kidnapped | Aubrey Cain | Recurring role |
| 2009 | Bored to Death | Suzanne | |
| 2011 | Good Vibes | Jeena | Voice role |
| 2016 | Goliath | Lucy Kittridge | Main role |
| 2019–2020 | The L Word: Generation Q | Rebecca Dowery | Recurring role |
| 2021 | Y: The Last Man | Hero Brown | Main role |
| 2025 | Law & Order: Organized Crime | Detective Frances Tanner | 4 episodes |
| 2026 | Wonder Man | TBA | Post-production |
| Year | Title | Role | Notes |
| 2008 | Farragut North | Molly Stearns | Linda Gross Theater |
| 2012 | Lonely, I'm Not | Businesswoman | Second Stage Theatre |
| 2014 | O.P.C. | Romi Weil | American Repertory Theater |