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Liam O'Brien Filmography
| 2025 | The Mighty Nein (TV Series) · as Caleb (voice) |
| 2025 | Lego Marvel Avengers: Strange Tails · as Doctor Strange |
| 2025 | LEGO Marvel Avengers: Strange Tails (TV Series) · as Doctor Strange (voice) / Red Skull (voice) |
| 2023 | Lego Marvel Avengers: Code Red · as Red Skull / Hydra Goon 2 (voice) |
| 2023 | Candela Obscura (TV Series) · as Game Master |
| 2023 | Star Wars: Young Jedi Adventures (TV Series) · as Master Estala Maru (voice) |
| 2022 | The Legend of Vox Machina (TV Series) · as Vax'ildan (voice) |
| 2021 | Baki Hanma (TV Series) · as Suedo |
| 2021 | Exandria Unlimited (TV Series) · as Orym, Of The Air Ashari |
| 2021 | Star Wars: The Bad Batch (TV Series) · as Bolo (voice) |
| 2021 | DOTA: Dragon's Blood (TV Series) · as Nikdo / Bandit #1 / Bandit #4 (voice) |
| 2020 | Carmen Sandiego: To Steal or Not to Steal · as Professor Maelstrom / Diplomat / Guard 2 (voice) |
| 2019 | Amphibia (TV Series) · as Additional Voices |
| 2019 | Mobile Suit Gundam: The Origin - Advent of the Red Comet (TV Series) · as Gihren Zabi |
| 2019 | DC Super Hero Girls (2019) (TV Series) · as Zod |
| 2019 | Ultraman (2019) (TV Series) · as Da Moroboshi |
| 2019 | Code Geass: Lelouch of the Re;Surrection · as Lloyd |
| 2019 | Carmen Sandiego (TV Series) · as Professor Maelstrom |
| 2018 | Modest Heroes · as The Invisible Man (segment: Invisible) |
| 2018 | LEGO Marvel Super Heroes: Black Panther - Trouble in Wakanda · as Doctor Strange (voice) |
| 2018 | |
| 2017 | Mobile Suit Gundam: The Origin V - Clash at Loum · as Gihren Zabi |
| 2017 | Marvel Future Avengers (TV Series) · as Red Skull |
| 2017 | Marvel's Spider-Man (TV Series) · as Dr. Strange |
| 2017 | Sagas of Sundry (TV Series) · as Emmett Markham |
| 2017 | Boruto: Naruto Next Generations (TV Series) · as Gaara |
| 2016 | Baki (2018) (TV Series) · as Additional Voices |
| 2016 | Mobile Suit Gundam: The Origin IV - Eve of Destiny · as Gihren Zabi |
| 2016 | Hulk: Where Monsters Dwell · as Doctor Strange (voice) |
| 2016 | Mobile Suit Gundam: The Origin III - Dawn of Rebellion · as Gihren Zabi |
| 2015 | Everstar · as Paxley (voice) |
| 2015 | Mobile Suit Gundam: The Origin II - Artesia's Sorrow · as Gihren Zabi |
| 2015 | CelebriD&D (TV Series) · as Vax'ildan |
| 2015 | Pickle and Peanut (TV Series) · as Head Mannequin |
| 2015 | Boruto: Naruto the Movie · as Gaara |
| 2015 | The Phoenix Incident · as Jacob Reynolds |
| 2015 | Critical Role (TV Series) · as Caleb Widogast |
| 2015 | Mobile Suit Gundam: The Origin I - Blue-Eyed Casval · as Gihren Zabi |
| 2014 | Transformers: Robots in Disguise (2015) (TV Series) · as Underbite |
| 2014 | The Last: Naruto the Movie · as Kotetsu Hagane |
| 2014 | The Marvel Experience · as Red Skull |
| 2014 | Star Wars Rebels: Spark of Rebellion · as Yogar Lyste/ Morad Sumar/ Vendor 1 |
| 2014 | Star Wars Rebels (TV Series) · as Lt. Lyste / Stormtrooper Squad Leader (voice) |
| 2014 | Iron Man and Captain America: Heroes United · as The Red Skull (voice) |
| 2014 | Sailor Moon Crystal (TV Series) · as Nephrite |
| 2014 | Sengoku Basara: End of Judgement (TV Series) · as Tokugawa |
| 2014 | Mobile Suit Gundam Unicorn 7 · as Hill Dawson |
| 2014 | Tiger & Bunny: The Rising · as Yuri Petrov |
| 2014 | JLA Adventures: Trapped in Time · as Aquaman / Batwing Computer (voice) |
| 2013 | Iron Man & Hulk: Heroes United · as The Red Skull (voice) |
| 2013 | The Tale of The Princess Kaguya · as Ayabe No Uchimaro |
| 2013 | Phineas and Ferb: Mission Marvel · as Red Skull (voice) |
| 2013 | Marvel's Hulk and the Agents of S.M.A.S.H. (TV Series) · as Arkon |
| 2013 | Iron Man: Rise of Technovore · as Additional Voices |
| 2013 | Berserk: The Golden Age Arc III - The Advent · as Torturer |
| 2012 | Sofia the First (TV Series) · as Boswell (voice) |
| 2012 | Magi: The Labyrinth of Magic (TV Series) · as Jamil |
| 2012 | Tiger & Bunny the Movie: The Beginning · as Yuri Petrov |
| 2012 | Marvel's Avengers Assemble (TV Series) · as Red Skull (voice) |
| 2012 | Sword Art Online (TV Series) · as Spectator |
| 2012 | Berserk: The Golden Age Arc II - The Battle for Doldrey · as Torturer |
| 2012 | Marvel's Ultimate Spider-Man (TV Series) · as Doctor Strange |
| 2012 | Lagrange: The Flower of Rin-ne (TV Series) · as Dizelmine |
| 2011 | Ikki Tousen in Kyoto · as Additional Voices |
| 2011 | Shelf Life (TV Series) · as Soldier Joe |
| 2011 | Thor: Legend of the Magical Hammer · as Additional Voices |
| 2011 | Fate/Zero (TV Series) · as Kariya Matou |
| 2011 | Blade (2011) (TV Series) · as Daniel |
| 2011 | Gekijouban Sengoku Basara: The Last Party · as Tokugawa Ieyasu |
| 2011 | Onigamiden - Legend of the Millennium Dragon · as Raiko |
| 2011 | Tiger & Bunny (TV Series) · as Yuri Petrov |
| 2010 | Bleach the Movie: Hell Verse · as Jushiro Ukitake |
| 2010 | G.I. Joe: Renegades (TV Series) · as Captain Anatoly Krimov/red Star/german Ceo (voice) |
| 2010 | Regular Show (TV Series) · as Tango (voice) |
| 2010 | NFL Rush Zone (TV Series) · as Rz6.0 |
| 2010 | Mobile Suit Gundam Unicorn (TV Series) · as Hill Dawson |
| 2010 | Nura: Rise of the Yokai Clan (TV Series) · as Additional Voices |
| 2010 | Planet Hulk · as Hiroim (voice) |
| 2010 | Wolverine and the X-Men: Fate of the Future · as Kurt Wagner / Nightcrawler (voice) (archive Footage) |
| 2010 | |
| 2010 | Durarara!! (TV Series) · as Morita |
| 2009 | |
| 2009 | |
| 2009 | Gurren Lagann the Movie: The Lights in the Sky are Stars · as Guinble Kite |
| 2009 | Sengoku Basara (TV Series) · as Ieyasu Tokugawa |
| 2009 | Afro Samurai: Resurrection · as Shichogoro (voice) |
| 2009 | Kurokami The Animation (TV Series) · as Various |
| 2008 | Bleach: Fade to Black, I Call Your Name · as Jushiro Ukitake |
| 2008 | Gormiti (TV Series) · as Additional Voices |
| 2008 | Wolverine and the X-Men (TV Series) · as Kurt Wagner (voice) |
| 2008 | Blade of the Immortal (TV Series) · as Araya Kawakami |
| 2007 | Bleach the Movie: The DiamondDust Rebellion · as Jushiro Ukitake |
| 2007 | Phineas and Ferb (TV Series) · as Red Skull (voice) |
| 2007 | Blue Dragon (TV Series) · as Dolsk |
| 2007 | Gurren Lagann (TV Series) · as Guinble Kaito |
| 2007 | Naruto Shippuden (TV Series) · as Gaara, The Fifth Kazekage |
| 2007 | Afro Samurai (TV Series) · as Kihachi |
| 2006 | Bleach: Memories of Nobody · as Jushiro Ukitake |
| 2006 | Mega Man Star Force (TV Series) · as Cygnus (2007) |
| 2006 | Code Geass: Lelouch of the Rebellion (TV Series) · as Lloyd Asplund |
| 2006 | Buso Renkin (TV Series) · as Hideki Okakura |
| 2006 | Tales from Earthsea · as Additional Voices |
| 2006 | Brave Story · as Ishioka |
| 2006 | The Third: The Girl with the Blue Eye (TV Series) · as Additional Voices (2006) |
| 2006 | Ergo Proxy (TV Series) · as Vincent Law |
| 2006 | Hellsing Ultimate (TV Series) · as Zeppelin Commander |
| 2006 | Fate/Stay Night (TV Series) · as Archer |
| 2005 | Paradise Kiss (TV Series) · as Seiji Kisragi |
| 2005 | Final Fantasy VII: Advent Children · as Red Xiii |
| 2005 | |
| 2005 | GUN×SWORD (TV Series) · as Ray Lundgren |
| 2005 | Kamichu! (TV Series) · as Inu Osho |
| 2005 | EyeShield 21 (TV Series) · as Shozo Togano |
| 2005 | MÄR (TV Series) · as Nanashi |
| 2004 | Gankutsuou: The Count of Monte Cristo (TV Series) · as Andrea Cavalcanti |
| 2004 | Bleach (TV Series) · as Jushiro Ukitake |
| 2004 | Destiny of the Shrine Maiden (TV Series) · as Tsubasa |
| 2004 | Izo · as Prince |
| 2004 | Naruto the Movie: Ninja Clash in the Land of Snow · as Nadara Roga |
| 2004 | Girls Bravo (TV Series) · as Kazuharu Fukuyama |
| 2004 | DearS (TV Series) · as No. 3 |
| 2004 | Ghost Talker's Daydream (TV Series) · as Editor, Driver |
| 2004 | Cutie Honey · as Cast |
| 2004 | Samurai Champloo (TV Series) · as Yamane |
| 2004 | Appleseed · as Eswat Soldier |
| 2004 | Monster (TV Series) · as Kenzou Tenma |
| 2004 | The Melody of Oblivion (TV Series) · as Horu |
| 2004 | The Phoenix (TV Series) · as Ohtomo |
| 2004 | Koi Kaze (TV Series) · as Kei Odagiri |
| 2004 | Tenjho Tenge (TV Series) · as Shin Natsume |
| 2004 | Paranoia Agent (TV Series) · as Mitsuhiro Maniwa |
| 2004 | Daphne in the Brilliant Blue (TV Series) · as Mysterious Guy |
| 2003 | The Fairytaler (TV Series) · as Cast |
| 2003 | Aquarian Age Saga II: Don't Forget Me... · as Lancelot Army Commander |
| 2003 | Gungrave (TV Series) · as Sam (episode 13) |
| 2003 | Mermaid Forest (TV Series) · as Yuta |
| 2003 | R.O.D the TV (TV Series) · as Criminal #1, Editior |
| 2003 | Ikki Tousen (TV Series) · as Ganyro |
| 2003 | Rumiko Takahashi Anthology (TV Series) · as Betto |
| 2003 | Texhnolyze (TV Series) · as Haruhiko Toyama |
| 2003 | Gad Guard (TV Series) · as Truck Driver |
| 2003 | Scrapped Princess (TV Series) · as Furet |
| 2003 | Stellvia of the Universe (TV Series) · as Cast |
| 2003 | .hack//Legend of the Twilight (TV Series) · as Tom |
| 2003 | Wolf's Rain (TV Series) · as Soldier |
| 2003 | Bobobo-bo Bo-bobo (TV Series) · as Pana |
| 2002 | Duel Masters (TV Series) · as Shobu Kirifuda |
| 2002 | Naruto (TV Series) · as Gaara |
| 2002 | Ghost in the Shell: Stand Alone Complex (TV Series) · as Fake Laughing Man |
| 2002 | Yukikaze (TV Series) · as Operator |
| 2002 | The Twelve Kingdoms (TV Series) · as Various |
| 2001 | The Prince of Tennis (TV Series) · as Masashi Arai |
| 2001 | Saiyuki: Requiem - The Motion Picture · as Various |
| 2001 | Figure 17 (TV Series) · as Toru |
| 2001 | Haré+Guu (TV Series) · as Clive |
| 2001 | Comic Party (TV Series) · as Taishi Kuhonbutsu |
| 2000 | Descendants of Darkness (TV Series) · as (voice) |
| 2000 | Boys Be... (TV Series) · as Makoto Kurumizura |
| 2000 | Boogiepop Phantom (TV Series) · as Yoji Suganuma |
| 1999 | Di Gi Charat (TV Series) · as Yoshimi |
| 1999 | Gokudou-kun Manyuuki (TV Series) · as Master Tei (2001) |
| 1999 | To Heart (TV Series) · as Various |
| 1998 | His and Her Circumstances (TV Series) · as Kouhei Fukada |
| 1998 | Otsuyu: Kaidan botan-dôrô · as Tomozo |
| 1997 | Revolutionary Girl Utena (TV Series) · as Mamiya Chiba |
| 1995 | Slayers (TV Series) · as Rezo |
| 1994 | DNA² (TV Series) · as Junta Momonari |
| 1993 | Black Jack (TV Series) · as Sasaki |
| 1992 | K.O. Beast (TV Series) · as Bud Mint |
| 1992 | Sailor Moon (TV Series) · as Nephrite (viz Media Dub) |
| 1989 | Patlabor: The Movie · as Kataoka (2006) |
| 1972 | Emmerdale (TV Series) · as Ethan Blake |
| 2025 | The Mighty Nein (TV Series) · as Executive Producer |
| 2022 | The Legend of Vox Machina (TV Series) · as Executive Producer |
| 2022 | The Legend of Vox Machina (TV Series) |
| 2022 | Dirty Laundry (2022) (TV Series) · as Self - Guest |
| 2020 | The Great Debate (TV Series) · as Self - Panelist |
| 2020 | Narrative Telephone (TV Series) · as Self |
| 2018 | Um, Actually... (TV Series) · as Self - Contestant |
| 2018 | Between the Sheets (TV Series) · as Self |
| 2018 | Handbooker Helper (TV Series) · as Self |
| 2017 | The Wednesday Club (TV Series) · as Self |
| 2016 | Talks Machina (TV Series) · as Self |
| 2012 | All Work No Play (TV Series) · as Self - Host |
| 2008 | Adventures in Voice Acting · as Self |
| 2006 | The Third: The Girl with the Blue Eye (TV Series) |
| 2004 | DearS (TV Series) |
| 2004 | Koi Kaze (TV Series) |
| 2012 | All Work No Play (TV Series) · as Created By |
| 2011 | X-Men (TV Series) · as English Adaptation |
| 2010 | Iron Man (2010) (TV Series) · as English Adaptation |
| 2007 | Naruto Shippuden (TV Series) · as Adaptation |
| 2005 | Naruto the Movie 2: Legend of the Stone of Gelel · as Adr Script Writer |
| 2005 | GUN×SWORD (TV Series) · as English Adaptation |
| 2004 | DearS (TV Series) · as English Adaptation |
| 2004 | Koi Kaze (TV Series) · as English Adaptation |
| 2002 | Naruto (TV Series) · as Adaptation |