Satoru Saishu (born 1936) is a Japanese biologist and philosopher. Trained in zoology at the University of Tokyo, he has written extensively on bioethics, environmental issues, disability, and the relationship between science and society. His work is known for its reflections on life, human dignity, and coexistence. His best-known book, "Hoshiko ga Iru" ("Hoshiko Is Here"), reflects on life with his daughter, who had a severe disability, exploring the meaning of human dignity, family, and living together with others.