Gackt Camui (神威 楽斗, Kamui Gakuto, born July 4, 1973), known mononymously by his stage name Gackt, is a Japanese musician, singer-songwriter, multi-instrumentalist, actor, and author. He has been active since 1994, first as the frontman of the short-lived independent band Cains:Feel, then for the now defunct visual kei rock band Malice Mizer, before starting his solo career in 1999. He has released nine studio albums and, with forty-three singles released, holds the male soloist record for most top ten consecutive singles in Japan music history. His single "Returner (Yami no Shūen)", released on June 20, 2007, was his first single to reach the number one spot on the Oricon charts. He became the first Japanese artist to release his music catalog on iTunes in October 2007.

Besides the modern entertainment industry, his music has been used as theme songs for various video games, anime films and television series. In addition to his music career Gackt has acted in a few films, including the film he wrote, Moon Child, and his international debut Bunraku, and TV series such as the NHK drama Fūrin Kazan. He also performed live in a theatre stage play.