Mark O'Brien (gebore 7 Mei 1984) is 'n Kanadese akteur, regisseur, en skrywer. Hy is bekend vir sy rolle in die rolprent Arrival (2016) en in die televisiereekse Republic of Doyle (2010), Halt and Catch Fire (2014), en The Last Tycoon (2016). 2015: End of Days, Inc. 2016: Arrival 2019: Hammer 2019: Goalie De facto 2005: Legends and Lore of the North Atlantic 2006: You're It! 2010: Republic of Doyle 2012: Diary of a Deadly P.I. 2014: Halt and Catch Fire 2016: The Last Tycoon Mark O'Brien in die Internet-rolprentdatabasis Mark O'Brien op Twitter