Simon Hayama is an English-language voice actor known for his work in the dubbing of Japanese anime series. His career includes a range of supporting and character roles in prominent anime titles produced primarily in the 2000s.

One of Hayama's notable early roles was in the hit science fiction series Mobile Suit Gundam Seed, where he voiced the character Dalida Lolaha Chandra II, a crew member aboard the warship Archangel. He reprised this role for the sequel series, Mobile Suit Gundam Seed Destiny, as well as for the special compilation film Mobile Suit Gundam Seed Destiny Final Plus: The Chosen Future.

Hayama is also recognized for his work on the long-running and popular anime series Gintama. In this series, he provided the voice for the character Shoyo Yoshida, the kind and philosophical master of the protagonist Gintoki Sakata. This role is significant to the series' backstory, as Shoyo's death profoundly impacts several main characters. Hayama also voiced the character Utsuro in the same series, who is the original persona from whom Shoyo Yoshida was created, showcasing his range in portraying two connected but distinct characters.

His other voice roles in anime include the part of Taishi Kase in Starship Operators, Fuchinobe in the animated film Sword of the Stranger, and a role as an Umibozu Soldier in the film Ghost in the Shell: Stand Alone Complex - The Laughing Man. Beyond anime, his acting credits extend to several live-action television series, including roles in Stargate SG-1, The 4400, and The Dead Zone. In the animated feature film L.O.R.D: Legend of Ravaging Dynasties, he voiced the character Qi La (Zillah).

Throughout his career, Simon Hayama has worked alongside a large number of fellow voice actors across various projects. His body of work is primarily focused on English dubbing for anime and roles in science fiction television series from the early 2000s.