C. polymorpha may refer to:
Callyspongia polymorpha, a demosponge first described in 1984 Canna polymorpha, a garden plant Capparis polymorpha, a climbing shrub Carex polymorpha, a true sedge Ceratomyxa polymorpha, a myxosporean parasite Chlumetia polymorpha, an owlet moth Coniochaeta polymorpha, a pleomorphic yeast Coprosma polymorpha, a plant found on the South Island Crepis polymorpha, a hawk's-beard native to eastern and southern Europe Cucurbita polymorpha, a plant used in traditional Native American medicine Cunninghamella polymorpha, a pin mold