Ja-Hyeong Gu is a South Korean voice actor born on April 22, 1965. He is known for his extensive work dubbing anime series and films for Korean audiences, lending his voice to a wide array of iconic characters.

His career encompasses many notable roles in major anime series. He is the Korean voice of Keiichi Maebara in When They Cry - Higurashi. His other prominent dubbing roles include Spike Spiegel in Cowboy Bebop, Itachi Uchiha in Naruto, Sosuke Aizen in Bleach, Miroku in Inuyasha, Dr. Kenzo Tenma in Monster, and Gintoki Sakata in Gintama. He also voiced Kenshin Himura in Rurouni Kenshin, Zechs Marquise/Milliardo Peacecraft in Mobile Suit Gundam Wing, and Abel Nightroad in Trinity Blood. His repertoire extends to live-action dubbing, where he is the regular Korean voice-over actor for Hollywood stars Denzel Washington, John Cusack, and Keanu Reeves.