Bernhard Riemann masanin lissafin Jamus ne wanda ya rayu a karni na 19. Sunan "Bernhard Riemann" yawanci yana nufin mutum ne, amma kuma yana iya komawa ga aikinsa na lissafin lissafi, wanda ya haɗa da gudummawa ga fagage daban-daban kamar bincike, lissafi, topology, ka'idar lamba, da kimiyyar lissafi. A cikin ilimin lissafi, sunan "Riemann" yana da alaƙa da mahimman ra'ayoyi da yawa, kamar su Riemann hypothesis, Riemann integral, Riemann surface, Riemann curvature tensor, da Riemann mapping theorem, da sauransu. Ana kiran waɗannan ra'ayoyin ne bayan Bernhard Riemann saboda ya ba da gudummawa sosai ga haɓakawa da fahimtar su.Bayan ilimin lissafi, Riemann kuma sananne ne da aikinsa a fannin kimiyyar lissafi, musamman a fannin electromagnetism da optics. Ya gabatar da ka’idar ilmin lissafi na filayen lantarki da na maganadisu, wanda a yanzu ake kiransa da Riemannian geometry, sannan kuma ya ba da gudunmawa wajen nazarin yaduwar igiyoyin ruwa da kuma tunani da karkatar da haske.