Kei Satō (佐藤 慶, Satō Kei, born in Aizuwakamatsu – May 2, 2010) was a Japanese character actor and narrator. He is known for his work with Japanese New Wave director Nagisa Oshima, and for several films with Kaneto Shindo, such as Onibaba and Kuroneko. He won the best actor award from Kinema Junpo for the films The Ceremony and Nihon no akuryō. He also worked as a narrator for many documentaries, both on television and film.