Kōji Tamaki (玉置 浩二, Tamaki Kōji, born September 13, 1958) is a Japanese singer-songwriter and actor. He has been well known as frontman of the rock band Anzen Chitai that debuted in 1982 and enjoyed a successful career, particularly during the 1980s.

In the 1990s, he also began his career as a solo artist. He is widely regarded as one of the greatest Japanese vocalists. In 2014, he was ranked first by a panel of 200 experts for the best ever singing voice in Japan.