Cillian O'Sullivan
Known for
Screen acting is the trade Cillian O'Sullivan has worked in, and what is documented about his work is brief. 'Maze' sits in the filmography beside the rest. He was 19 in 2008, the year of the first credit. Drama accounts for most of what is on file. Add the film and television entries together and the total is 15. One credit that can be pinned down is 'In From the Cold', playing Chauncey.
Cillian O'Sullivan
4 Movies
11 Series
Screen acting is the trade Cillian O'Sullivan has worked in, and what is documented about his work is brief. 'Maze' sits in the filmography beside the rest. He was 19 in 2008, the year of the first credit. Drama accounts for most of what is on file. Add the film and television entries together and the total is 15. One credit that can be pinned down is 'In From the Cold', playing Chauncey.
TV Shows
Plays Conor Martin
6Degrees
2012
Plays Chauncey
In From the Cold
2022
Plays Orin
Then You Run
2023
Plays Dr. Roger Korby
Star Trek: Strange New Worlds
2022
Plays Devlin
Daredevil: Born Again
2025
Plays Dave Garrick
The Boy That Never Was
2024
Plays Skip Sutherland
The Blacklist
2013
Plays Eirik
Vikings
2013
Plays Shane Sullivan
Chicago P.D.
2014
Plays Nathan Alexander
Bull
2016
Plays Scot Weitzen
FBI: Most Wanted
2020
Latest Trailers
Watch Trailer
Misty Button
Full Filmography
The Lost Princess
Alec Touati
2025
Film
Daredevil: Born Again
Devlin · 3 episodes
2025–
TV
The Boy That Never Was
Dave Garrick · 3 episodes
2024–
TV
Then You Run
Orin · 8 episodes
2023–
TV
Star Trek: Strange New Worlds
Dr. Roger Korby · 4 episodes
2022–
TV
In From the Cold
Chauncey · 8 episodes
2022–
TV
FBI: Most Wanted
Scot Weitzen · 1 episode
2020–
TV
Misty Button
James
2019
Film
Maze
Bobby
2017
Film
Photos
Frequently Asked Questions
How old is Cillian O'Sullivan and where are they from?
Cillian O'Sullivan is 37 years old, born on September 28, 1989 in New York, USA.
What are the most famous roles of Cillian O'Sullivan?
Cillian O'Sullivan is best known for roles in Halo: Nightfall, Maze, The Lost Princess.
How many movies has Cillian O'Sullivan been in?
Over a 18-year career (since 2008), Cillian O'Sullivan has appeared in 4 movies and 11 TV shows.
What was Cillian O'Sullivan's first movie?
The career of Cillian O'Sullivan began with Uncle Bill's Barrel (2008).
What is Cillian O'Sullivan's most recent movie or series?
Cillian O'Sullivan's most recent release is The Lost Princess, which premiered on October 16, 2025.
What TV shows has Cillian O'Sullivan appeared in?
On television, Cillian O'Sullivan has appeared in Vikings, The Blacklist, Chicago P.D., Daredevil: Born Again.
Cillian O'Sullivan
1989-09-28 · New York, USA
Screen acting is the trade Cillian O'Sullivan has worked in, and what is documented about his work is brief. 'Maze' sits in the filmography beside the rest. He was 19 in 2008, the year of the first credit. Drama accounts for most of what is on file. Add the film and television entries together and the total is 15. One credit that can be pinned down is 'In From the Cold', playing Chauncey.