Tominaga Nakamoto was a Japanese philosopher. He was educated at the Kaitokudō academy founded by members of the mercantile class of Osaka, but was ostracised shortly after the age of 15. Tominaga belonged to a Japanese rationalist school of thought and advocated a Japanese variation of atheism, mukishinron. He was also a merchant in Osaka. Only a few of his works survive; his Setsuhei has been lost and may have been the reason for his separation from the Kaitokudō, and around nine other works' titles are known. The surviving works are his Okina no Fumi, Shutsujō Gogo, and three other works on ancient musical scales, ancient measurements, and poetry.