Mark O'Brien
Known for Acting · 55 credits
- Born
- 1984-05-07 (age 42)
- Place of birth
- St. Johns, Newfoundland, Canada
- Also known as
- Mark O’Brien
Biography
Mark O'Brien (born May 7th, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle (2010) and Tom Rendon in Halt and Catch Fire (2014).
Known For
TV Shows (13)
The Kelly Clarkson Show
2019
as Self
Hannibal
2013
as Randall Tier
Warehouse 13
2009
as Jerry Hoffler
Republic of Doyle
2010
as Des Courtney
Halt and Catch Fire
2014
as Tom Rendon
Perry Mason
2020
as Thomas Milligan
Killjoys
2015
as Grayson Hicks
Your Honor
2020
as Father Jay
City on a Hill
2019
as Jimmy Ryan
The Copenhagen Test
2025
as Edmund Cobb
The Last Tycoon
2017
as Max Miner
61st Street
2022
as Officer Logan
The Sticky
2024
as Charlie
Movies (42)
Nuremberg
2025
as Colonel John Amen
Ready or Not
2019
as Alex
Arrival
2016
as Captain Marks
Marriage Story
2019
as Carter Mitchum
Bad Times at the El Royale
2018
as Larsen Rogers
The Darkest Minds
2018
as Rob Meadows
How It Ends
2018
as Jeremiah
Anon
2018
as Cyrus Frear
The Front Runner
2018
as Billy Shore
Seven Veils
2025
as Paul
Kin
2018
as Jake
Goalie
2019
as Terry Sawchuk
Parallel
2018
as Josh
Blue Bayou
2021
as Ace
How to Plan an Orgy in a Small Town
2015
as Bruce Buck
Shadow of God
2025
as Mason Harper
The Memory Keeper
2025
as Elizeus Carrier
State Like Sleep
2019
as Darren
The Four Horsemen
2008
as Eric Rollins
Hammer
2019
as Chris Davis
Grown Up Movie Star
2010
as Will
Beat Down
2012
as Michael
Topper
2025
as Topper
The One That Got Away
2008
as Tommy Palchek
The Voices of Our Mother
2026
as William
The Righteous
2021
as Aaron Smith
End of Days, Inc.
2015
as Jason
Wanderer
2016
as Eric
Heartless Disappearance Into Labrador Seas
2008
as Charlie
The Dark Stranger
2016
as Mark
Quiet at Dawn
2009
as Watts
Nice People
The Outer Threat
Snarbuckled
2010
as Jacob O'Higgins
Cut from the Same Cloth
2009
as Jack Cochrane
Dennis
2015
as Dennis
Good in the Room
as Charlie
Brad
2010
as Brad
Epilogue
2008
as Henry
Better People
as John
Mum's the Word
2009
as Curtis
Sweetieface
2013
as Sam
About Mark O'Brien
Mark O'Brien (born May 7th, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle (2010) and Tom Rendon in Halt and Catch Fire (2014). With 55 credits spanning from 2008 to 2026, Mark O'Brien has appeared in 42 films and 13 TV shows.
Fans searching for Mark O'Brien movies, Mark O'Brien filmography, or the latest projects starring Mark O'Brien can stream many of these titles on CineFlixo, free and in HD, with no subscription required.
Most Popular Mark O'Brien Movies
- Nuremberg (2025) — as Colonel John Amen
- Ready or Not (2019) — as Alex
- Arrival (2016) — as Captain Marks
- Marriage Story (2019) — as Carter Mitchum
- Bad Times at the El Royale (2018) — as Larsen Rogers
Where to Watch Mark O'Brien Films
Most Mark O'Brien movies and series are available to stream on CineFlixo in full HD, completely free and without signup. Browse the complete filmography above to jump directly to any title. For more films and the latest web series featuring Mark O'Brien, check our movies catalogue and browse page.