- Bancroft, Joseph (1836 - 1894), Surgeon
- Bancroft, Thomas Lane (1860 - 1933), Surgeon and Naturalist
- Barbaro, Katia, Scientist
- Barking spider
- see Bird-eating spiders, Family: Theraphosidae, Genus: Selencosmia
- Barnes, Chris, Scientist
- BEACH
- Bees and wasps, Order: Hymenoptera, Suborder: Apocrita
- Bees, wasps and stinging ants, Treatment for stings
- Beetles, Order: Coleoptera
- Beetles, Treatment for envenomation
- Berncastle, J.
- Bird-eating spiders, Family: Theraphosidae, Genus: Selencosmia
- Black house spiders, Family: Desidae (formerly Amaurobiidae), Genus: Baduma
- Black snakes, Family: Epalid, Genus: Pseudechis
- Black window spider
- see Black house spiders, Family: Desidae (formerly Amaurobiidae), Genus: Baduma
- Blue ringed octopus, Family: Octopodidae, Genus: Hapalochlaena
- Blue ringed octopus, Treatment for stings
- Blue-bellied black snake
- see Spotted black snakes, Family: Elapidae, Genus: Pseudechis, Species: P. guttatus
- Bluebottles, Class: Hydrozoa, Genus: Physalia
- Box jellyfish, Class: Cubozoa, Genus: Chironex, Species:C. fleckeri
- Broad headed snakes, Genus: Hoplocephalus, Species: H. bungaroides
- Brown house spiders, Family: Theridiidae, Genus: Steatoda
- Brown snakes, Family: Elapidae, Genus: Pseudonaja (formerly Demansia)
- Brusic, Vladimir, Scientist
- Bush, Sean P., Scientist
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