Liam Christopher O'Brien is an American voice actor, writer, and voice director. He is perhaps best known for his roles as Gaara of the Sand in Naruto, Captain Jushiro Ukitake in Bleach, Nephrite of Sailor Moon and Sailor Moon Crystal in the Viz Media dub, War in the video game Darksiders, Vincent Law in Ergo Proxy, and Illidan Stormrage in the Warcraft game series (World of Warcraft: The Burning Crusade). He is married to fellow voice actress Amy Kincaid. He is also known for his roles as Vax'ildan and Caleb Widogast on the Dungeons & Dragons webseries Critical Role.
O'Brien currently hosts the All Work No Play podcast with fellow voice actor Sam Riegel.
- Red Skull - Avengers Assemble, Phineas and Ferb: Mission Marvel, Marvel Future Avengers, and Marvel Disk Wars: The Avengers
- Arkon - Hulk and the Agents of S.M.A.S.H.
- The Amazing Boswell - Sofia the First
- Morad Sumar and Yogar Lyste - Star Wars Rebels