Saeki Kenzo (佐伯健三) is a Japanese singer. He was the vocalist of HALMENS.

He also has a live band he performs with called Saeki Kenzo & Boogie The Mach Motors, they have not released any studio releases. Saeki was born in Ichikawa City, Chiba Prefecture. He started as a musician using kanji but changed his name to Katakana and hiragana due to a stroke counting fortune telling.