Mark O'Brien
- Compleanno:
- 05/07/1984
- Luogo di nascita:
- St. Johns, Newfoundland, Canada:
 | Shadow of God (2025) Mason Harper |
 | Seven Veils (2025) Paul |
 | Topper (2025) Topper |
 | Blue Bayou (2021) Ace |
 | The Righteous (2021) Aaron Smith |
 | Hammer (2019) Chris Davis |
 | Marriage Story (2019) Carter Mitchum |
 | Ready or Not (2019) Alex Le Domas |
 | Goalie (2019) Terry Sawchuk |
 | State Like Sleep (2019) Darren |
 | The Front Runner (2018) Billy Shore |
 | Bad Times at the El Royale (2018) Larsen Rogers |
 | Kin (2018) Jake |
 | The Darkest Minds (2018) Rob Meadows |
 | How It Ends (2018) Jeremiah |
 | Anon (2018) Cyrus Frear |
 | Parallel (2018) Josh |
 | Arrival (2016) Captain Marks |
 | The Dark Stranger (2016) Mark |
 | How to Plan an Orgy in a Small Town (2015) Bruce Buck |
 | End of Days, Inc. (2015) Jason |
 | Dennis (2015) Dennis |
 | Beat Down (2012) Michael |
 | Snarbuckled (2010) Jacob O'Higgins |
 | Brad (2010) Brad |
| | Mum's the Word (2009) Curtis |
 | Grown Up Movie Star (2009) Will |
| | Quiet at Dawn (2009) Watts |
| | Cut from the Same Cloth (2009) Jack Cochrane |
 | Heartless Disappearance Into Labrador Seas (2008) Charlie |
| | Epilogue (2008) Henry |
 | The One That Got Away (2008) Tommy Palchek |
 | The Four Horsemen (2008) Eric Rollins |
| | Better People John |
| | The Voices of Our Mother William |
| | The Embers and the Stars |
| | Falsehood Elizeus Carrier |
 | Nuremberg Col. John Amen |