Seiya Yamamoto (山元 聖也, Yamamoto Seiya, born December 24) is a Japanese seiyu (voice actor) from Ōita Prefecture who is affiliated with B-Box. His hobbies are audio and video editing and stunts. He is 169 cm tall.

| Title | ||||||
|---|---|---|---|---|---|---|
HAIKYU!! The Dumpster Battle | Cheering Section Member (voice) | 7.852 | 2024-02-16 | 5.8857 | ||
The Apothecary Diaries | Official (voice) | 8.665 | 2023-10-22 | 89.3306 | ||
Doctor Elise: The Royal Lady with the Lamp | Man B (voice) | 7.5 | 2024-01-10 | 10.8834 | ||
An Archdemon's Dilemma: How to Love Your Elf Bride | People in the City (voice) | 7.2 | 2024-04-05 | 8.2096 | ||
Mobile Suit Gundam GQuuuuuuX | (voice) | 7.2 | 2025-04-09 | 18.2993 | ||
Hotel Inhumans | Subordinate (voice) | 7.8 | 2025-07-06 | 6.8933 | ||
Goodbye, Lara | Male Boxing Club Member (voice) | 7.5 | 2026-07-06 | 7.2742 | ||
Goodbye, Lara | Actor on TV (voice) | 7.5 | 2026-07-06 | 7.2742 | ||
Goodbye, Lara | Cafe Stand Attendant (voice) | 7.5 | 2026-07-06 | 7.2742 | ||
Goodbye, Lara | Knight (voice) | 7.5 | 2026-07-06 | 7.2742 |