C. cooki may refer to:
Cephaloscyllium cooki, a little-known species of catshark Chaoborus cooki, a species of phantom midges Crambione cooki, a rare species of jellyfish Corallus cookii, Cook's tree boa or Cooke's tree boa, a species of snake Cyanopica cooki, Iberian magpie, a species of bird Cymatioa cooki, a species of saltwater clam