Koji Ishii (born as Kouzou Ishii on July 1, 1960) is a Japanese voice actor, currently affiliated with Vi-Vo.
| Movie | Kamen Rider Reiwa: The First Generation | Another 1 (voice) | 2019-12-21 |
| Movie | Case Closed: The Fist of Blue Sapphire | Ginzo Nakamori (voice) | 2019-04-12 |
| Movie | Case Closed: The Crimson Love Letter | Togo Kaieda (voice) | 2017-04-15 |
| Movie | Kamen Rider #1 | Mysterious Ganma | 2016-03-26 |
| Movie | Doraemon: Nobita and the Birth of Japan | Tajikara (voice) | 2016-03-05 |
| Series | My Hero Academia | Snatch (voice) | 2016-04-03 |
| Series | 91 Days | Scusa (voice) | 2016-07-09 |
| Movie | The Empire of Corpses | Ulysses Grant (voice) | 2015-10-02 |
| Series | Akame ga Kill! | Honest | 2014-07-07 |
| Series | Problem Children Are Coming from Another World, Aren't They? | Griffon (voice) | 2013-01-12 |
| Movie | Fairy Tail: Phoenix Priestess | Cannon (voice) | 2012-08-18 |
| Movie | Nintama Rantaro the Movie: Ninjutsu Academy - All Hands on Deck! | Tetsumaru Kinoshita (voice) | 2011-03-12 |
| Movie | Gokaiger Goseiger Super Sentai 199 Hero Great Battle | Damaras (voice) | 2011-06-11 |
| Movie | Fullmetal Alchemist: The Sacred Star of Milos | Graz (voice) | 2011-07-02 |
| Movie | Kaizoku Sentai Gokaiger: The Movie - The Flying Ghost Ship | Chief of Staff Damaras (Voice) | 2011-08-06 |
| Series | Rainbow | Ishihara | 2010-04-06 |
| Movie | Redline | Machine Head (voice) | 2009-08-14 |
| Series | Vampire Knight | Asato Ichijo | 2008-04-08 |
| Movie | Mobile Suit Zeta Gundam - A New Translation III: Love is the Pulse of the Stars | Dogosse Giar's Captain (voice) | 2006-03-04 |
| Series | Burst Angel | Unknown | 2004-04-06 |
| Movie | Yu-Gi-Oh! The Movie | Anubis (voice) | 2004-08-13 |
| Series | Genshiken | Unknown | 2004-10-11 |
| Series | Gankutsuou | Giovanni Bertuccio (voice) | 2004-10-06 |
| Movie | New Fist of the North Star: The Cursed City | Rogue | 2003-07-02 |
| Series | Ninja Scroll: The Series | Unknown | 2003-04-14 |
| Series | Papuwa | Harada Umako | 2003-09-30 |
| Series | Gunslinger Girl | Enzo (voice) | 2003-10-08 |
| Series | Magical Shopping Arcade Abenobashi | Ms. Aki (voice) | 2002-04-04 |
| Movie | Beyblade the Movie: Fierce Battle | Daichi's Father (voice) | 2002-08-17 |
| Movie | Animation Runner Kuromi | President / Surfer (voice) | 2001-03-30 |
| Movie | Sin: The Movie | John Blade (voice) | 2000-10-24 |
| Series | Legend of Black Heaven | Oji Tanaka (voice) | 1999-07-08 |
| Series | Record of Lodoss War: Chronicles of the Heroic Knight | Groder (voice) | 1998-04-01 |
| Series | Flint: The Time Detective | Oda Nobunaga | 1998-10-01 |
| Series | TRIGUN | Brad (voice) | 1998-04-02 |
| Series | Princess Nine | Shinsaku Kido | 1998-04-08 |
| Movie | The Day the Earth Moved | 1997-01-01 | |
| Series | The King of Braves GaoGaiGar | Koutaro Taiga | 1997-02-01 |
| Movie | Macross Dynamite Seven | Mitsu (voice) | 1997-12-18 |
| Movie | M.D. Geist II: Death Force | Lower Commander | 1996-03-01 |
| Movie | Angel Legend | Kuroda Seikichi | 1996-12-13 |
| Series | Slayers | Zanaffar (voice) | 1995-04-07 |
| Series | Wedding Peach | Tarashi | 1995-04-05 |
| Series | Nurse Angel Ririka SOS | Keto | 1995-07-07 |
| Movie | Legend of Crystania: The Motion Picture | Garudi | 1995-07-29 |
| Movie | Legend of Crystania: The Chaos Ring | 1995-07-21 | |
| Movie | Gatchaman OVA | Joe Asakura the Condor (G-2) | 1994-10-01 |
| Movie | Legend of the Galactic Heroes: Overture to a New War | Pastolle | 1993-12-18 |
| Movie | Legend of the Galactic Heroes: Golden Wings | Krumbach | 1992-12-12 |
| Movie | Space Family Carlvinson | Police Officer (voice) | 1988-12-21 |
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