Ken Nishikiori is a Japanese music artist, composer, and performer born on January 23, 1960 in Izumo, Shimane Prefecture, Japan. His career encompasses vocal performance for major video game franchises as well as theme song contributions to anime television series.

Nishikiori is perhaps most widely recognized for his vocal work on the main theme of the 2008 video game Super Smash Bros. Brawl. On this track, a large-scale orchestral piece with Latin lyrics composed by Nobuo Uematsu, Nishikiori performed as the featured tenor soloist. This credit places him within one of the most celebrated and best-selling crossover fighting game series in the industry.

Within the anime domain, Nishikiori is known for performing the second opening theme song for the 1996 television series Violinist of Hamelin, also known as Hamelin no Violin Hiki. He is credited with the song Incomplete Concerto, which served as the show's opening theme for a portion of its twenty-five episode run on Japanese television. The series, produced by Studio Deen, is a fantasy adventure based on the manga by Michiaki Watanabe.

Beyond his performance credits, Nishikiori has worked as a composer for video game soundtracks. His composition credits include contributions to titles such as the Super Smash Bros. series and Shinsetsu Samurai Spirits: Bushidou Retsuden. He has also been associated with the music department of the entertainment company PONY CANYON INC.. His career thus spans both on-microphone vocal performance for orchestral game scores and behind-the-scenes music production for animated and interactive media.