Liam O'Malley is an American voice actor known for a singular credit in the English dub of the classic anime series The Slayers. His most recognized role is the character Zangulus, a wandering swordsman and mercenary who appears in the first season of the show. O'Malley provided the voice for Zangulus exclusively in the thirteenth episode of The Slayers, which marked the character's first appearance. In this same episode, he also voiced an unnamed Warrior character.

The circumstances surrounding O'Malley's performance are tied to a specific period in the production of the English dub. After the thirteenth episode, the dubbing process went on a hiatus that lasted nearly two years. When production resumed, the recording studio was unable to re-establish contact with many of the original voice actors, leading to widespread recasting. As a result, the role of Zangulus was taken over by voice actor Ted Lewis for all subsequent appearances of the character from the fourteenth episode onward. Due to this unique situation, O'Malley's portrayal of Zangulus is limited to a single early episode.

No further information about Liam O'Malley's career background, other major voice roles, recurring collaborations with specific studios or directors, or notable achievements in the field of voice acting is available.