Cast & creator
Cillian O'Sullivan
Best known for The Blacklist, Chicago P.D., Vikings
Also known as: Cillian O'Suilleabhain, Cillian Ó Súilleabháin
Movies
5
film credits
Series
12
television credits
Career
17
2008–2025 · acting roles
Credit score
6.9
average across scored titles
Signature credits
Known for
Across film & television
Filmography (17)
Showing 17 of 17 credits
Series
★ 7.6
The Blacklist
Skip Sutherland
2013
Series
★ 8.4
Chicago P.D.
Shane Sullivan
2014
Series
★ 8.1
Vikings
Eirik
2013
Series
★ 7.6
FBI: Most Wanted
Scot Weitzen
2020
Series
★ 7.9
Star Trek: Strange New Worlds
Dr. Roger Korby
2022
Series
★ 7.1
Bull
Nathan Alexander
2016
Series
★ 8.2
Daredevil: Born Again
Devlin
2025
Series
★ 6.7
In From the Cold
Chauncey
2022
Movie
★ 6.8
Halo: Nightfall
Christian Ramsey (uncredited)
2014
Movie
★ 6.3
The Lost Princess
Alec Touati
2025
Series
★ 6.3
The Boy That Never Was
Dave Garrick
2024
Series
★ 5.1
Then You Run
Orin
2023S
Series
Seacht
Michael
2008
Series
6Degrees
Conor Martin
2012
Movie
★ 5.8
Maze
Bobby
2017U
Movie
Uncle Bill's Barrel
Tom Lynch
2008
Movie
★ 5.2
Misty Button
James
2019