- Canary, Jana
- Cardiac arrythmia
- Caterpillars, Order: Lepidoptera
- Centipedes and millipedes, Class: Chilopoda and Diplopoda
- Centipedes and millipedes, Treatment for stings
- Chiropsalmus quadrigatus, Class: Cubozoa, Genus: Chiropsalmus
- Clarence River snake
- see Rough scaled snakes, Family: Elapidae, Genus: Tropidechis, Species: T. carinatus
- Class: Arachnida, Order: Araneae, Spiders, Australian
- Class: Chilopoda and Diplopoda, Centipedes and millipedes
- Class: Cubozoa, Genus: Carukia, Spieces: C. barnesi, Irukandji
- Class: Cubozoa, Genus: Carybdea, Species: C. rastoni, Jimbles
- Class: Cubozoa, Genus: Chironex, Species:C. fleckeri, Box jellyfish
- Class: Cubozoa, Genus: Chiropsalmus, Chiropsalmus quadrigatus
- Class: Hydrozoa, Genus: Physalia, Bluebottles
- Class: Reptilia, Order: Squamata, Suborder: Serpentes, Snakes, Australian
- Class: Scyphomedusae, Genus: Pelagia, Species: P. noctiluca, Mauve blubbers
- Class: Scyphozoa, Genus: Cyanea, Species: C. capillata, Sea blubbers
- Class: Scyphozoa, Jellyfish, Australian
- Cleland, J. B.
- Collett's snakes, Family: Elapidae, Genus: Pseudechis, Species: P. colletti
- Commonwealth Serum Laboratories
- see CSL Limited
- Cone shells
- see Cone snails, Family: Conidae, Genus: Conus
- Cone snails, Family: Conidae, Genus: Conus
- Cone snails, Treatment for stings
- Copperheads, Family: Elapidae, Genus: Austrelaps
- CSL Limited
- Cupboard spider
- see Brown house spiders, Family: Theridiidae, Genus: Steatoda
- Current treatments, Snake bite
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