Masaya Onosaka is a Japanese voice actor who works for Aoni Production. In 2010 he won the "Best Personality" Seiyu Award. Onosaka was born in Osaka. He is known for his Kansai accent in some of his roles.
| Movie | Mirage Queen's Elegant Vacations | Zukia (Voice) | 2025-05-23 |
| Series | Train to the End of the World | Jizou (voice) | 2024-04-01 |
| Series | Hetalia: World Stars | (voice) | 2021-04-01 |
| Series | The Vampire Dies in No Time | Unknown | 2021-10-04 |
| Series | Mashin Sentai Kiramager | Marshmallow Jamen (voice) | 2020-03-08 |
| Series | SAINT SEIYA: Knights of the Zodiac | Hydra Ichi (voice) | 2019-07-19 |
| Movie | The Prince of Tennis: Best Games!! Tezuka vs Atobe | Unknown | 2018-08-24 |
| Movie | One Piece Episode of East Blue | Chew (voice) | 2017-08-26 |
| Movie | Persona 3 the Movie: #4 Winter of Rebirth | Jin Shirato (voice) | 2016-01-23 |
| Movie | GANTZ:O | Susumu Kimura (voice) | 2016-10-14 |
| Movie | One Piece Film: GOLD | Spandam (voice) | 2016-07-23 |
| Movie | Ressha Sentai ToQger vs. Kyoryuger: The Movie | Clock Shadow (Voice) | 2015-01-17 |
| Series | One-Punch Man | Pri-Pri-Prisoner (voice) | 2015-10-05 |
| Movie | Persona 3 the Movie: #3 Falling Down | Jin Shirato (voice) | 2015-04-04 |
| Movie | Persona 3 the Movie: #2 Midsummer Knight's Dream | Jin Shirato (voice) | 2014-06-07 |
| Series | New Prince of Tennis OVA vs. Genius10 | Takeshi Momoshiro (voice) | 2014-10-29 |
| Series | The Prince of Tennis II | Takeshi Momoshiro (voice) | 2012-01-04 |
| Series | Saint Seiya Omega | Hydra Ichi (voice) | 2012-04-01 |
| Movie | One Piece Episode of Nami: Tears of a Navigator and the Bonds of Friends | Chew (voice) | 2012-08-25 |
| Movie | 009 Re:Cyborg | Great Britain / Cyborg 007 (voice) | 2012-10-27 |
| Series | You're Being Summoned, Azazel-san | Azazel (voice) | 2011-04-08 |
| Series | THE iDOLM@STER | Oil Baron (voice) | 2011-07-08 |
| Series | Toriko | Teppei (voice) | 2011-04-03 |
| Series | Twin Angel: Twinkle Paradise | アレキサンダー | 2011-07-05 |
| Series | Tales of Gekijou | Zelos Wilder | 2011-12-18 |
| Series | Horizon in the Middle of Nowhere | Unknown | 2011-10-01 |
| Movie | The Prince of Tennis: Showdown in England's Tennis Fortress | Takeshi Momoshiro | 2011-09-03 |
| Movie | Welcome to the Space Show | Bogner (voice) | 2010-02-18 |
| Movie | Quiz Magic Academy: The Original Animation 2 | Taiga (voice) | 2010-02-11 |
| Movie | Trigun: Badlands Rumble | Vash The Stampede | 2010-04-24 |
| Movie | Hetalia: Axis Powers: Paint It, White! | France (voice) | 2010-06-05 |
| Movie | Book Girl | Konoha's Father (voice) | 2010-05-01 |
| Series | Koe de Oshigoto | Shigekazu Sakanami (voice) | 2010-11-17 |
| Series | Eden of the East | Director Honda (voice) | 2009-04-09 |
| Series | Hetalia | France | 2009-01-24 |
| Movie | Gurren Lagann the Movie: The Lights in the Sky Are Stars | Leeron Littner (voice) | 2009-04-25 |
| Series | The Prince of Tennis: Another Story - Messages From Past and Future | Takeshi Momoshiro (voice) | 2009-05-26 |
| Series | Neo Angelique Abyss | Jade | 2008-04-06 |
| Movie | Gurren Lagann The Movie: Childhood's End | Leeron Littner (voice) | 2008-09-06 |
| Movie | Tales of Symphonia The Animation: Kaette Kita Kratos-sensei no Private Lesson | Unknown | 2008-09-26 |
| Series | Lovely★Complex | Fukagawa Haruka (voice) | 2007-04-07 |
| Series | Gurren Lagann | Leeron Littner (voice) | 2007-04-01 |
| Series | Tales of Symphonia: The Animation | Zelos Wilder (voice) | 2007-06-08 |
| Movie | Genesis of Aquarion: Wings of Genesis | Pierre Vieira (voice) | 2007-09-21 |
| Series | Moetan | Ah-kun (voice) | 2007-07-09 |
| Series | Kaiji | Ota (voice) | 2007-10-03 |
| Series | Baccano! | Isaac Dian (voice) | 2007-07-27 |
| Series | Yomigaeru Sora – Rescue Wings | Daigo Nihonmatsu | 2006-01-09 |
| Series | Ayakashi: Samurai Horror Tales | Kikimaru (voice) | 2006-01-13 |
| Series | Madan Senki Ryukendo | Zanryujin (voice) | 2006-01-08 |
| Series | The Prince of Tennis: The National Tournament | 桃城武 | 2006-03-24 |
| Series | Kanon | Evil scientist (movie) (voice) | 2006-10-06 |
| Series | MÄR: Märchen Awakens Romance | Nanashi | 2005-04-03 |
| Series | Aquarion | Pierre Vieira (voice) | 2005-04-05 |
| Series | Bobobo-bo Bo-bobo | Don Patch (voice) | 2005-10-01 |
| Series | Hell Girl | Unknown | 2005-10-04 |
| Movie | Saint Seiya Heaven Chapter: Overture | Hydra Ichi (voice) | 2004-02-14 |
| Series | Bleach | Shinji Hirako (voice) | 2004-10-05 |
| Series | Burst Angel | Azuma Iriki | 2004-04-06 |
| Movie | Fighting Spirit: Champion Road | Takeshi Sendo (voice) | 2003-06-25 |
| Series | Requiem from the Darkness | Fushimiya (voice) | 2003-10-03 |
| Series | Daigunder | Dorimogu | 2002-04-05 |
| Series | Ultimate Muscle: The Kinnikuman Legacy | Mantaro Muscle | 2002-01-09 |
| Movie | Kinnikuman II Sei: Muscle Ninjin Soudatsu! Choujin Daisensou | Unknown | 2002-07-20 |
| Series | Saint Seiya: The Hades Chapter | Algol (voice) | 2002-11-09 |
| Movie | Millennium Actress | Kyouji Ida (voice) | 2002-09-14 |
| Movie | The Prince of Tennis: A Day on Survival Mountain | Takeshi Momoshiro (voice) | 2002-12-12 |
| Series | The SoulTaker | Unknown | 2001-04-04 |
| Series | Battle Doll: Angelic Layer | Ichiro Mihara (voice) | 2001-04-01 |
| Series | The Prince of Tennis | Unknown | 2001-10-10 |
| Movie | Kinnikuman II | Unknown | 2001-07-14 |
| Movie | Cardcaptor Sakura: The Sealed Card | Kerberos (voice) | 2000-07-15 |
| Series | Fighting Spirit | Takeshi Sendo (voice) | 2000-10-03 |
| Series | Pet Shop of Horrors | Leon Orcot (voice) | 1999-03-01 |
| Movie | Power Stone: Vol. 6: The Last Battlefield | Unknown | 1999-01-01 |
| Series | Kamikaze Kaitou Jeanne | Kaiki Nagoya | 1999-02-13 |
| Series | Power Stone | Unknown | 1999-04-03 |
| Series | Magic User's Club! | Takeo Takakura (voice) | 1999-07-07 |
| Series | One Piece | Sham (voice) | 1999-10-20 |
| Series | Omishi Magical Theater Risky Safety | Moe's father | 1999-10-05 |
| Movie | Magic User's Club! vs. Shamanic Princess | Takeo Takakura (voice) | 1998-01-01 |
| Series | TRIGUN | Vash the Stampede (voice) | 1998-04-02 |
| Movie | Cardcaptor Sakura | Kerberos (voice) | 1998-04-07 |
| Series | Momoiro Sisters | (voice) | 1998-08-25 |
| Series | Cardcaptor Sakura | Kerberos(big) (voice) | 1998-04-07 |
| Series | AIKa | Michikusa Shuntarou (voice) | 1997-04-25 |
| Series | Master of Mosquiton '99 | Unknown | 1997-09-30 |
| Series | Twin Signal | A Suke (voice) | 1996-09-21 |
| Movie | Twin Signal: Family Game | A Suke (voice) | 1996-09-21 |
| Movie | Panzer Dragoon | Kyle | 1996-10-26 |
| Series | Maps | Calion (voice) | 1994-07-08 |
| Series | Gatchaman | Ken Washio (voice) | 1994-09-30 |
| Movie | Gatchaman OVA | Ken Washio the Eagle (G-1) | 1994-10-01 |
| Movie | Kamen Rider SD: Strange?! Kumo Otoko | Skyrider (voice) | 1993-01-24 |
| Series | Sailor Moon | Jadeite (voice) | 1992-03-07 |
| Movie | Candy Candy: The Movie | Cornwell, Alistair | 1992-04-25 |
| Movie | Rokudenashi BLUES | Katsuji Yamashita (voice) | 1992-07-11 |
| Movie | Capricorn | Jill (voice) | 1991-04-05 |
| Series | Be-Bop High School | Hiroshi | 1990-01-26 |
| Movie | Nineteen 19 | Kazushi Kubota (voice) | 1990-07-27 |
| Movie | Super Real Mahjong: Mahjong Battle Scramble | Ryu (voice) | 1990-12-21 |
| Movie | Maps: Legendary Space Wanderer | Calion (voice) | 1987-07-14 |
| Movie | Delpower X Bakuhatsu Miracle Genki! | Horie | 1986-12-21 |