Shigetada Nakanishi (born January 7, 1942) is a Japanese biochemist and neuroscientist. Both a medical doctor and biomedical researcher by training, Nakanishi is the director of the Osaka Bioscience Institute and professor emeritus at Kyoto University. He has received several scientific awards for his research in neuroscience, having characterized the molecular structure or function of several protein receptors. He is a foreign associate of the National Academy of Sciences and a foreign honorary member of the American Academy of Arts and Sciences in the U.S.