Seth Leslie is an English voice actor known primarily for his work on the English-language dubs of several prominent anime series, particularly those within the Gundam and Inazuma Eleven franchises. His voice acting credits span from the early 2010s, with a concentration of roles in action and science fiction series.

Leslie is most recognized for his substantial contributions to the Gundam metaseries. In the original Gundam Build Fighters series and its sequel, Gundam Build Fighters Try, he provided the voice for Allan Adams, an engineer who later becomes a coach at the Gunpla Academy. He also voiced several other characters within the same franchise, including Chairman Mashita and Takeshi Iori in Gundam Build Fighters. Another notable Gundam role was Fezarl Ezelcant, the supreme leader of the Vagan faction, in Mobile Suit Gundam AGE.

In the sports anime series Inazuma Eleven and its sequels, Leslie took on a wide array of characters. His roles in this franchise include Jude Sharp, Aitor Cazador, Alpha, and Zanark Avalonic across various series titles such as Inazuma Eleven GO and Inazuma Eleven GO 2: Chrono Stone. He also appears in the film Inazuma Eleven GO: Kyūkyoku no Kizuna Griffon in the roles of Bailong and Jude Sharp.

Beyond these major franchises, Seth Leslie's filmography includes a minor role as a Hong Kong resident in the 2014 animated film Transformers: Age of Extinction. His other credits include roles in live-action productions such as the film Ice Comet 3D and the television series Tokens of Rage. While his filmography includes both live-action and voice work, his most prolific and well-documented contributions are within the field of anime voice acting.