Kenji Yamamoto ( 山本健司, born July 1, 1958 ) is a Japanese music composer and arranger who has been responsible for producing and composing soundtracks, including opening and ending sequence themes for various anime, tokusatsu and video game projects in the 1980s, 1990s and 2000s.

Most notably, he has worked on soundtracks of various Dragon Ball video games. He has also composed background music for Dragon Ball Z Kai, a revamped version of the anime series Dragon Ball Z.

Yamamoto is a board member of the Japanese Composer Arranger Association. He has also released several arrange albums of his compositions.

On March 9, 2011, Yamamoto's work on Dragon Ball Kai and numerous video games in the franchise were found to infringe on third-party copyrights including artists as well as other soundtracks, and as a result the BGM he worked on was replaced in Kai with the original Z score and in video games such as Budokai HD collection and Raging Blast 2. Since then he has been banned from composition.