Wilhelm Moritz Keferstein (7 June 1833, Winsen (Luhe) – 25 January 1870) was a German naturalist.
He originally studied hydraulic engineering in Hanover, later becoming a lecturer and professor of zoology at the University of Göttingen.
With zoologist Ernst Ehlers (1835-1925), he wrote Zoologische Beiträge gesammelt im Winter 1859/60 in Neapel und Messina... in 1861.
He also made important contributions to Heinrich Georg Bronn's Die Klassen und Ordnungen des Thier-Reichs (Classes and Orders of the Animal Kingdom).
Keferstein's tree frog is named after him (a species he described in 1868),[3] as is a genus of polychaetes, Kefersteinia (family Hesionidae).