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Mark O'Brien Filmography
| 2025 | The Copenhagen Test (TV Series) · as Cobb |
| 2025 | Nuremberg · as Colonel John Amen |
| 2025 | Shadow of God · as Mason Harper |
| 2025 | Topper · as Topper |
| 2024 | The Sticky (TV Series) · as Charlie |
| 2023 | Seven Veils · as Paul |
| 2022 | 61st Street (TV Series) · as Officer Logan |
| 2021 | Blue Bayou · as Ace |
| 2021 | The Righteous · as Aaron Smith |
| 2020 | Your Honor (TV Series) · as Father Jay |
| 2020 | Perry Mason (2020) (TV Series) · as Thomas Milligan |
| 2019 | Hammer · as Chris Davis |
| 2019 | Marriage Story · as Carter Mitchum |
| 2019 | City on a Hill (TV Series) · as Jimmy Ryan |
| 2019 | Ready or Not · as Alex Le Domas |
| 2019 | Goalie · as Terry Sawchuk |
| 2018 | State Like Sleep · as Darren |
| 2018 | The Front Runner · as Billy Shore |
| 2018 | Bad Times at the El Royale · as Larsen Rogers |
| 2018 | Kin · as Jake |
| 2018 | The Darkest Minds · as Rob Meadows |
| 2018 | How It Ends · as Jeremiah |
| 2018 | Anon · as Cyrus Frear |
| 2018 | Parallel · as Josh |
| 2016 | Arrival · as Captain Marks |
| 2016 | The Last Tycoon (TV Series) · as Max Miner |
| 2015 | End of Days, Inc. · as Jason |
| 2015 | How to Plan an Orgy in a Small Town · as Bruce Buck |
| 2015 | The Dark Stranger · as Mark |
| 2015 | Killjoys (TV Series) · as Grayson Hicks |
| 2014 | Halt and Catch Fire (TV Series) · as Tom Rendon |
| 2013 | Hannibal (TV Series) · as Randall Tier |
| 2012 | Beat Down · as Michael |
| 2010 | Republic of Doyle (TV Series) · as Des Courtney |
| 2009 | Grown Up Movie Star · as Will |
| 2009 | Warehouse 13 (TV Series) · as Jerry Hoffler |
| 2008 | Heartless Disappearance Into Labrador Seas · as Charlie |
| 2008 | The One That Got Away · as Tommy Palchek |
| 2008 | The Four Horsemen · as Eric Rollins |