M. darwini may refer to:
Mallada darwini Masoniella darwini Megalomus darwini Mesocyclops darwini, a copepod crustacean species in the genus Mesocyclops Microdontomerus darwini Minihippus darwini Mycale darwini Myllocerus darwini Mylodon darwini, an extinct giant ground sloth species Mysteria darwini
See also M. darwinii (disambiguation) Darwini (disambiguation)