Mark O'Brien

May 7, 1984 (age 42) St. Johns, Newfoundland, Canada
IMDb

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).

Their titles like Arrival, Ready or Not, and Marriage Story - their biggest roles first.
Last updated: June 14, 2026

25 titles
Community avg: 8.17 /10
  • 1
    1
    Arrival
    2016November 2016 by Denis Villeneuve
    Drama, Science Fiction, Mystery
    Drama, Science Fiction, Mystery
    8.55 Masterpiece--
  • 2
    2
    Ready or Not
    2019August 2019 by Matt Bettinelli-Olpin
    Horror, Comedy
    Horror, Comedy
    8.00 Excellent
  • 3
    3
    Marriage Story
    2019September 2019 by Noah Baumbach
    Drama
    Drama
    8.66 Masterpiece--
  • 4
    4
    Bad Times at the El Royale
    2018October 2018 by Drew Goddard
    Thriller, Mystery, Crime
    Thriller, Mystery, Crime
    7.78 Excellent-
  • 5
    5
    The Darkest Minds
    2018July 2018 by Jennifer Yuh Nelson
    Action, Adventure, Drama
    Action, Adventure, Drama
    7.95 Excellent
  • 6
    6
    Anon
    2018May 2018 by Andrew Niccol
    Science Fiction, Crime, Mystery
    Science Fiction, Crime, Mystery
    6.98 Good
  • 7
    7
    How It Ends
    2018July 2018 by David M. Rosenthal
    Science Fiction, Thriller, Mystery
    Science Fiction, Thriller, Mystery
    6.30 Decent++
  • 8
    8
    Nuremberg
    2025November 2025 by James Vanderbilt
    History, Drama
    History, Drama
    8.45 Excellent++
  • 9
    9
    Kin
    2018August 2018 by Josh Baker
    Science Fiction, Action, Adventure
    Science Fiction, Action, Adventure
    7.10 Good
  • 10
    10
    The Front Runner
    2018November 2018 by Jason Reitman
    Drama, History
    Drama, History
    6.98 Good
  • 11
    11
    Parallel
    2018April 2018 by Isaac Ezban
    Science Fiction, Fantasy, Horror
    Science Fiction, Fantasy, Horror
    7.15 Good+
  • 12
    12
    Blue Bayou
    2021September 2021 by Justin Chon
    Drama
    Drama
    8.29 Excellent+
  • 13
    13
    How to Plan an Orgy in a Small Town
    2015September 2015 by Jeremy LaLonde
    Drama, Comedy
    Drama, Comedy
    6.57 Good--
  • 14
    14
    Shadow of God
    2025March 2025 by Michael Peterson
    Horror
    Horror
    7.30 Good++
  • 15
    15
    The Copenhagen Test
    2025 by Thomas Brandon
    Action & Adventure, Mystery, Sci-Fi & Fantasy
    Action & Adventure, Mystery, Sci-Fi & Fantasy
    7.59 Excellent--
  • 16
    16
    The Last Tycoon
    2017 by Billy Ray
    Drama
    Drama
    7.91 Excellent
  • 17
    17
    Seven Veils
    2025March 2025 by Atom Egoyan
    Drama
    Drama
    7.26 Good+
  • 18
    18
    Republic of Doyle
    2010–2014 by Allan Hawco
    Comedy, Drama
    Comedy, Drama
    7.90 Excellent-
  • 19
    19
    State Like Sleep
    2019January 2019 by Meredith Danluck
    Drama
    Drama
    6.95 Good
  • 20
    20
    Goalie
    2019March 2019 by Adriana Maggs
    Drama
    Drama
    7.87 Excellent-
  • 21
    21
    The Memory Keeper
    2025October 2025 by Ethan Hickey
    Science Fiction, Thriller
    Science Fiction, Thriller
    Needs more reviews
  • 22
    22
    Wanderer
    2016October 2016 by Jake Wilkens
    Drama, Thriller
    Drama, Thriller
    Needs more reviews
  • 23
    23
    Heartless Disappearance Into Labrador Seas
    2008September 2008 by Justin Simms
    Drama, Comedy
    Drama, Comedy
    Needs more reviews
  • 24
    24
    The Voices of Our Mother
    2026June 2026 by Mark O'Brien
    Horror
    Horror
    Needs more reviews
  • 25
    25
    Beat Down
    2012August 2012 by Deanne Foley
    Comedy, Drama
    Comedy, Drama
    Needs more reviews