Acting
Cillian O'Sullivan
Born 1989-09-28
New York, USA
Department: Acting
Known For
Prominent works featuring Cillian O'Sullivan
TV
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Vikings
2013
TMDB4.0
TV
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The Blacklist
2013
TMDB3.8
TV
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Chicago P.D.
2014
TMDB4.2
TV
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Daredevil: Born Again
2025
TMDB4.1
TV
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Star Trek: Strange New Worlds
2022
TMDB4.0
TV
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FBI: Most Wanted
2020
TMDB3.8
TV
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Bull
2016
TMDB3.5
Movie
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Halo: Nightfall
2014
TMDB3.4
TV
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In From the Cold
2022
TMDB3.4
Movie
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Maze
2017
TMDB2.9
Filmography & Credits
Complete career catalog (17 titles)
| Poster | Title | Character / Role | Type | Year |
|---|---|---|---|---|
 | The Lost Princess | Alec Touati | Movie | 2025 |
 | Daredevil: Born Again | Devlin | TV Series | 2025 |
 | The Boy That Never Was | Dave Garrick | TV Series | 2024 |
 | Then You Run | Orin | TV Series | 2023 |
 | Star Trek: Strange New Worlds | Dr. Roger Korby | TV Series | 2022 |
 | In From the Cold | Chauncey | TV Series | 2022 |
 | FBI: Most Wanted | Scot Weitzen | TV Series | 2020 |
 | Misty Button | James | Movie | 2019 |
 | Maze | Bobby | Movie | 2017 |
 | Bull | Nathan Alexander | TV Series | 2016 |
 | Halo: Nightfall | Christian Ramsey (uncredited) | Movie | 2014 |
 | Chicago P.D. | Shane Sullivan | TV Series | 2014 |
 | The Blacklist | Skip Sutherland | TV Series | 2013 |
 | Vikings | Eirik | TV Series | 2013 |
 | 6Degrees | Conor Martin | TV Series | 2012 |
| Uncle Bill's Barrel | Tom Lynch | Movie | 2008 | |
| Seacht | Michael | TV Series | 2008 |