Koji Tamaki (玉置 浩二, Tamaki Kōji?, born September 13, 1958) is a singer and actor from Asahikawa, Hokkaidō, Japan. He is the lead singer of the band Anzen Chitai(安全地帯). He married Hiroko Yakushimaru in January 1991 in Hawaiʻi, but they divorced in June 1998.