Portrait of Cillian O'Sullivan

Cillian O'Sullivan

Born: Thu, Sep 28 1989
Birthplace: New York, USA
Cillian O'Sullivan is 36 years old
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Acting Roles
Crew Roles

Movies (Acting Roles)

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Poster of The Lost Princess
The Lost Princess
Cillian O'Sullivan was 36 in The Lost Princess as 'Alec Touati'.
Movie Released: Thu, Oct 16 2025
Poster of Misty Button
Misty Button
Cillian O'Sullivan was 29 in Misty Button as 'James'.
Movie Released: Sun, Mar 17 2019
Poster of Maze
Maze
Cillian O'Sullivan was 27 in Maze as 'Bobby'.
Movie Released: Fri, Sep 22 2017
Poster of Halo: Nightfall
Halo: Nightfall
Cillian O'Sullivan was 24 in Halo: Nightfall as 'Christian Ramsey (uncredited)'.
Movie Released: Wed, Feb 05 2014
Poster of Uncle Bill's Barrel
Uncle Bill's Barrel
Cillian O'Sullivan was 19 in Uncle Bill's Barrel as 'Tom Lynch'.
Movie Released: Sat, Oct 18 2008

TV Shows (Acting Roles)

Sorted by Release Date
Ages in TV shows are based off the first air date and may not be accurate. View individual episode details for accurate ages
Poster of Daredevil: Born Again
Daredevil: Born Again
Cillian O'Sullivan was 35+ in Daredevil: Born Again as 'Devlin'.
TV Show Released: First Air Date
Tue, Mar 04 2025
Poster of The Boy That Never Was
The Boy That Never Was
Cillian O'Sullivan was 34+ in The Boy That Never Was as 'Dave Garrick'.
TV Show Released: First Air Date
Sun, Sep 01 2024
Poster of Then You Run
Then You Run
Cillian O'Sullivan was 33+ in Then You Run as 'Orin'.
TV Show Released: First Air Date
Fri, Jul 07 2023
Poster of Star Trek: Strange New Worlds
Star Trek: Strange New Worlds
Cillian O'Sullivan was 32+ in Star Trek: Strange New Worlds as 'Dr. Roger Korby'.
TV Show Released: First Air Date
Thu, May 05 2022
Poster of In From the Cold
In From the Cold
Cillian O'Sullivan was 32+ in In From the Cold as 'Chauncey'.
TV Show Released: First Air Date
Fri, Jan 28 2022
Poster of Bull
Bull
Cillian O'Sullivan was 26+ in Bull as 'Nathan Alexander'.
TV Show Released: First Air Date
Tue, Sep 20 2016
Poster of Chicago P.D.
Chicago P.D.
Cillian O'Sullivan was 24+ in Chicago P.D. as 'Shane Sullivan'.
TV Show Released: First Air Date
Wed, Jan 08 2014
Poster of The Blacklist
The Blacklist
Cillian O'Sullivan was 23+ in The Blacklist as 'Skip Sutherland'.
TV Show Released: First Air Date
Mon, Sep 23 2013
Poster of Vikings
Vikings
Cillian O'Sullivan was 23+ in Vikings as 'Eirik'.
TV Show Released: First Air Date
Sun, Mar 03 2013
Poster of Seacht
Seacht
Cillian O'Sullivan was 18+ in Seacht as 'Michael'.
TV Show Released: First Air Date
Mon, Jan 07 2008