C. darwinii may refer to:
Caberea darwinii Calceolaria darwinii, a perennial plant originally from Tierra del Fuego in the southern part of South America Camponotus darwinii, Forel, 1886, a carpenter ant species in the genus Camponotus Carex darwinii Cladonia darwinii Cosmocalanus darwinii Cyttaria darwinii, the type species of Cyttaria, a genus of ascomycete fungi
See also C. darwini (disambiguation) Darwinii (disambiguation)