Cillian O'Sullivan
Where to watch Cillian O'Sullivan in United States. On screen since 2008. Licensed apps only — 15 titles we track below.
Where to watch their titles
Vikings
Eirik · 2013
The Blacklist
Skip Sutherland · 2013
Chicago P.D.
Shane Sullivan · 2014
Daredevil: Born Again
Devlin · 2025
Star Trek: Strange New Worlds
Dr. Roger Korby · 2022
FBI: Most Wanted
Scot Weitzen · 2020
Bull
Nathan Alexander · 2016
Halo: Nightfall
Christian Ramsey (uncredited) · 2014
In From the Cold
Chauncey · 2022
Maze
Bobby · 2017
The Lost Princess
Alec Touati · 2025
The Boy That Never Was
Dave Garrick · 2024
Then You Run
Orin · 2023
Misty Button
James · 2019
6Degrees
Conor Martin · 2012