Takeharu Oonishi (大西 健晴, Ōnishi Takeharu, born July 8, 1967) is a Japanese seiyū (voice actor) and stage actor from Nara Prefecture. He is affiliated with Arts Vision and is a founding member of the theater company Akapera. He speaks the Kansai dialect. He is married to voice actress Masayo Kurata (倉田 雅世).
2025YAIBA: Samurai LegendTV showas Gerozaemon Geroda (voice) · 11 episodes2024Crayon Shin-chan the Movie: Our Dinosaur DiaryMovieas (voice)2024The FableTV showas Kenjiro Takoda (voice) · 14 episodes2018Kaitou Sentai Lupinranger vs. Keisatsu Sentai PatrangerTV showas Kunks Butylmercaptan (voice) · 1 episodes2017Case Closed: The Crimson Love LetterMovieas Producer (voice)2016Mobile Suit Gundam: The Origin IV – Eve of DestinyMovieas Anaheim Electronics Plant Manager (voice)2014Parasyte -the maxim-TV showas Ancient Languages Teacher (voice) · as Delinquent (voice) · 1 episodes2012Tokumei Sentai Go-BustersTV showas Tireloid (voice) · 1 episodes2011Hunter x HunterTV showas Cherry (voice) · as Tocino (voice) · as Worm (voice) · 2 episodes2011Crayon Shin-chan: Fierceness That Invites Storm! Operation Golden SpyMovieas Fukasi (voice)
2010Atashin'chi: The 3D MovieMovieas Shikai (voice)2010Gintama: The MovieMovieas Murata Tetsuya (voice)2006KekkaishiTV showas Madarao (voice) · 52 episodes
2006Pururun! Shizuku-chanTV showas Ametarou (voice) · 51 episodes2006Intrigue in the Bakumatsu – IrohanihohetoTV showas Kawai Tsuginosuke · 26 episodes2006Death NoteTV showas Gukku (voice) · 1 episodes2005Guyver: The Bioboosted ArmorTV showas Toshiaki Hayami / Bio-Freezer (voice) · 26 episodes2004Crayon Shin-chan: Fierceness That Invites Storm! The Kasukabe Boys of the Evening SunMovieas Justice's Subordinate 4 (voice)2003Crayon Shin-chan: Fierceness That Invites Storm! Yakiniku Road of HonorMovieas Taicho (voice)
2002The Boy and the Sea TurtleMovieas Man (voice)2002Atashin'chiTV showas Yamamoto (voice) · 663 episodes2001Puni Puni PoemyTV showas Alien 2 (voice) · 2 episodes
1999Ai no Wakakusa Yama MonogatariTV show12 episodes1999Crayon Shin-chan: Explosion! The Hot Spring's Feel Good Final BattleMovieas Employee (voice)
1998Popolocrois MonogatariTV showas Varudarosu · as Daiku · as Gon · 26 episodes