Naoko Otani (大谷直子 Ōtani Naoko, born April 3, 1950 in Sumida, Tokyo) is a Japanese actress. She made her screen debut in The Human Bullet while still a high school student, and became popular for her role in the NHK Asadora television programme Nobuko to Obāchan (信子とおばあちゃん, Nobuko and Grandmother) in 1969.
She published a collection of nude photos while pregnant. She has been married twice.