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Mark O'Brien

Mark O'Brien

Actor · b. 1984 · St. Johns, Newfoundland, Canada

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).

Movies24

  • Movie7.6

    Arrival

    2016 · 19K votes

  • Movie7.1

    Ready or Not

    2019 · 5.9K votes

  • Movie7.6

    Nuremberg

    2025 · 1.4K votes

  • Movie7.7

    Marriage Story

    2019 · 7.6K votes

  • Movie6.8
  • Movie7.0

    The Darkest Minds

    2018 · 3K votes

  • Movie5.3

    How It Ends

    2018 · 2.1K votes

  • Movie6.0

    Anon

    2018 · 1.8K votes

  • Movie5.9

    The Front Runner

    2018 · 389 votes

  • Movie7.4

    Blue Bayou

    2021 · 303 votes

  • Movie5.6

    The Outer Threat

    2026 · 14 votes

  • Movie6.1

    Kin

    2018 · 900 votes

  • Movie5.7

    Shadow of God

    2025 · 47 votes

  • Movie5.5

    Seven Veils

    2025 · 48 votes

  • Movie6.0

    Parallel

    2018 · 185 votes

  • Movie5.1
  • Movie
  • Movie4.7

    State Like Sleep

    2019 · 37 votes

  • Movie7.0

    The Memory Keeper

    2025 · 2 votes

  • Movie
  • Movie
  • Movie4.9

    The Dark Stranger

    2016 · 34 votes

  • Movie6.8

    Goalie

    2019 · 8 votes

  • Movie5.4

    Hammer

    2019 · 28 votes

Series13

  • TV6.3

    The Kelly Clarkson Show

    2019 · 72 votes

  • TV7.7

    Warehouse 13

    2009 · 781 votes

  • TV8.3

    Hannibal

    2013 · 3.1K votes

  • TV6.9

    Killjoys

    2015 · 542 votes

  • TV7.2

    Perry Mason

    2020 · 392 votes

  • TV7.0

    Republic of Doyle

    2010 · 38 votes

  • TV7.9

    Halt and Catch Fire

    2014 · 588 votes

  • TV8.1

    Your Honor

    2020 · 1.7K votes

  • TV7.3

    City on a Hill

    2019 · 193 votes

  • TV6.5

    The Copenhagen Test

    2025 · 104 votes

  • TV6.2

    61st Street

    2022 · 27 votes

  • TV7.0

    The Last Tycoon

    2017 · 68 votes

  • TV7.2

    The Sticky

    2024 · 79 votes