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- Gō Ichinose – Main Pokémon series (with Junichi Masuda)
- Tadashi Ikegami – Super Smash Bros. Melee, Kirby series
- Illreme – Katamari Damacy
- Tsuneo Imahori – Gungrave
- Naoto Ishida – F-Zero (with Yumiko Kanki)
- Jun Ishikawa – Kirby series, Alcahest
- Kozue Ishikawa – Wario Land 2, Wario Land 3, Star Fox 2 (with Yumiko Kanki)
- Mieko Ishikawa – Ys series
- Takayuki Ishikawa – Bemani, Mostly Beatmania and Beatmania IIDX
- Daisuke Ishiwatari – Guilty Gear series
- Kenji Ito – SaGa series, Seiken Densetsu 1, Koi ha Balance: Battle of Lovers, Tobal No. 1, Shinyaku Seiken Densetsu
- Noriyuki Iwadare – Lunar series, Langrisser series, Grandia series, Growlanser, Radiata Stories, Phoenix Wright: Ace Attorney: Trials and Tribulations
- Takayuki Iwai (usually credited as Anarchy Takapon to differentiate from Yuki Iwai (see below)) – Armored Warriors, Darkstalkers series (with Hideki Okugawa and others), X-Men: Children of the Atom (with Syun Nishigaki, Hideki Okugawa and Isao Abe), Dungeons & Dragons: Tower of Doom (with Isao Abe and OK Production), Cyberbots: Fullmetal Madness (with Akari.K -Lemon-, Kda Mto and Super 8 Iwami), Marvel Super Heroes, Super Puzzle Fighter II Turbo (with Tatsuro Zuzuki, Isao Abe, Yuko Kadota, Syun Nishigaki and Setsuo Yamamoto), Warzard, Street Fighter Alpha 3 (with Yuki Iwai, Isao Abe, Hideki Okugawa and Tetsuya Shibata), Plasma Sword: Nightmare of Bilstein (with Tetsuya Shibata (credited as Cyber-T))
- Yuki Iwai (sometimes credited as Yuki Satomura) – X-Men vs. Street Fighter (with Yuko Kadota), Marvel Super Heroes vs. Street Fighter (with Yuko Kadota), Super Gem Fighter: Mini Mix (with Isao Abe and Setsuo Yamamoto), Street Fighter III: New Generation and 2nd Impact: Giant Attack (with Hideki Okugawa), Street Fighter Alpha 3 (with Takayuki Iwai, Isao Abe, Hideki Okugawa and Tetsuya Shibata), Tech Romancer, Mega Man X, Mega Man X2, Demon's Crest
- Tappy Iwase – Policenauts, Metal Gear Solid
- Masaharu Iwata – Final Fantasy Tactics (with Hitoshi Sakimoto), Stella Deus: The Gate of Eternity (with Hitoshi Sakimoto), Tactics Ogre: Let Us Cling Together (with Hitoshi Sakimoto)
- Hiroyuki Iwatsuki – Choujin Sentai Jetman (NES), Mitsume ga Tooru (NES), Wild Guns (with Haruo Ohashi), Mighty Morphin Power Rangers: The Fighting Edition (with Haruo Ohashi), Mighty Morphin Power Rangers: The Movie (SNES, with Haruo Ohashi), Mighty Morphin Power Rangers (SNES, with Kinuyo Yamashita and Iku Mizutani)
- Takahiro Izutani – Metal Gear Solid: Portable Ops, Yakuza 2, Metal Gear Solid 4: Guns of the Patriots, Ninja Blade
- Naoki Itamura – Spinal Breakers, Tail to Nose: Great Championship, Mahjong Natsu Monogatari, Pipe Dream, Karate Blazers, Aero Fighters, Hyper V-Ball, F-1 Grand Prix (video game), F-1 Grand Prix Part II, F-1 Grand Prix Part III, SD F-1 Grand Prix
Read more about this topic: List Of Video Game Musicians