Seyama Sakichi (瀬山佐吉; fl. c. 1886 - 1900) was a Meiji era publisher based in Tokyo who published vividly illustrated books reflecting the changing social and cultural conditions of the era, including works on sexual relations and reproduction, transportation, and Western magic tricks (手品), but also on Japanese traditions, such as a series of books on Geisha. Seyama also published some of his own works in these fields.