Masaya Onosaka (小野坂 昌也 Onosaka Masaya), nascido em 13 de Outubro de 1964, em Osaka) é um seiyū, que trabalha para a Aoni Production. Em 2010, ele ganhou o prêmio de "Melhor Personalidade" no Seiyū Awards.^[1]

• Agent Aika (Mochikusa)
• Angelic Layer (Ichiro Mihara)
• Baccano! (Isaac Dian)
• Beast Machines (Obsidian)
• Bleach (Shinji Hirako)
• Bobobo-bo Bo-bobo (Don Patch)
• Cardcaptor Sakura (Cerberus (big))
• Captain Tsubasa J (Ryōma Hino, Announcer, others)
• Daigunder (Dorimogu)
• Digimon Frontier (SkullSatamon 1)
• Gun X Sword (Kaiji)
• Hajime no Ippo (Takeshi Sendo)
• Hetalia: Axis Powers (France)
• JoJo's Bizarre Adventure: Stardust Crusaders (Alessi)
• Kamikaze Kaito Jeanne (Kaisei)
• Kinnikuman Nisei (Kinniku Mantarou)
• Koutetsu Sangokushi (Chouhi Masunori)
• Lovely Complex (Haruka Fukagawa)
• Magic User's Club (Takeo Takakura)
• MÄR (Nanashi)
• Moetan (Ah-kun)
• Omishi Magical Theater: Risky Safety (Moe's Father)
• One Piece (Chuu, Sham, Spandam, Spandine)
• Oruchuban Ebichu (Employee, Kenji)
• Pet Shop of Horrors (Leon Orcot)
• Pokémon (Masaki Sonezaki)
• Power Stone (Fokker)
• The Prince of Tennis (Takeshi Momoshiro, Rick (ep 173))
• MegaMan NT Warrior (Torakichi Aragoma)
• Sailor Moon (Jadeite)
• Saint Seiya (Hydra Ichi)
• Shaman King (Ryō Kōjiro)
• Slam Dunk (Hikoichi Aida, Yasuharu Yasuda)
• The Soul Taker (Shiro Mibu)
• Sousei no Aquarion (Pierre)
• Spiral: Suiri no Kizuna (Takashi Sonobe)
• Tengen Toppa Gurren Lagann (Leeron)
• Tokyo Mew Mew (Asano-kun)
• Trigun (Vash the Stampede)
• Wolf's Rain (Ik)
• Yomigaeru Sora - Rescue Wings (Taigo Nihonmatsu)

• Agent Aika (Juntarō Michikusa)
• .hack//SIGN (Piroshi)
• Gatchaman (G-1 (Ken the Eagle))
• Magic User's Club (Takeo Takakura)
• Mobile Suit Gundam Seed Astray (Lowe Guele)
• Nineteen 19 (青涩岁月)
• Nurse Witch Komugi (Shiro Mibu)
• Tales of Symphonia: The Animation (Zelos Wilder)
• The Prince of Tennis (Takeshi Momoshiro)

• Cardcaptor Sakura: The Sealed Card (Cerberus (big))
• JoJo's Bizarre Adventure: Phantom Blood (Robert Edward O Speedwagon)
• Kinnikuman Nisei (Kinniku Mantarou)
• Millennium Actress (Kyoji Ida)
• The Prince of Tennis: The Two Samurai (Takeshi Momoshiro)
• Saint Seiya Tenkai Hen: Overture Hydra Ichi

• .hack (Piroshi)
• Dynasty Warriors séries (Zhao Yun, Zhuge Liang)
• Gungrave (Balladbird Lee)
• Magna Carta (video game) (Chris)
• Persona 3 (Jin)
• Rogue Galaxy (Simon Wicard)
• Tales of Symphonia (Zelos Wilder)
• Tales of Symphonia: Dawn of the New World (Zelos Wilder)
• Valkyrie Profile (Jun)
• Valkyrie Profile: Lenneth (Jun)
• Kinnikuman Generations (Kinniku Mantaro)

• The Wild Thornberrys (Bald Eagle, Giant Anteater, Gemsbok)

• D.N.Angel "trilogy" (with Soichiro Hoshi and Tomokazu Seki) - "Groovy Blue" (Dark Mousy)

• D.N.Angel Wink séries (Dark Mousy)
• Axis Powers: Hetalia (France)

• The Prince of Tennis The Best Of Seigaku Players séries (IX) - "Jump" (Takeshi Momoshiro)
• The Prince of Tennis On the Raido Theme séries (September, 2004) - "SAYONARA" (Takeshi Momoshiro)

Referências

• «Masaya Onosaka»  no Anime News Network

• Portal do Japão