Hajime Mizoguchi is a Japanese cellist and composer.
Mizoguchi started playing piano at the age of 3, and the cello at the age of 11. From 1978-1985 he attended the Tokyo National University of Fine Arts and Music where he majored in violoncello.
In 1986, he released his first album, Half Inch Dessert, being listed as composer, arranger, and performer. From that time on, he has released more than 20 albums including motion picture soundtracks.
He is noted for his compositions for animation, namely the soundtrack to the animated feature film Jin-Roh: The Wolf Brigade and a collaboration with Yoko Kanno on the animated series The Vision of Escaflowne and its subsequent film Escaflowne. He also collaborated with Keishi Urata on the animated series Texhnolyze. In 2006, he composed the music to Tokimeki Memorial Only Love and the Fuji TV noitamina series Jyu Oh Sei. He composed and plays the opening and ending theme for TV Asahi's series See the World by Train, which has run since June 1987. His song "Bruce", from 1986's Oasis Behind the Clear Water, appears in various scenes of the 1987 animation To-y.