Acting

Mark O'Brien

No community ratings yet· 8 horror films

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).

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Horror filmography

The Voices of Our Mother 2026

Director · Writer · as William

Shadow of God 2025

as Mason Harper

The Righteous 2021

Director · Writer · as Aaron Smith

Ready or Not 2019

as Alex

Parallel 2018

as Josh

The Dark Stranger 2016

as Mark

Nice People

Director · Actor

Little One

Actor

Mark O'Brien

Horror filmography

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