This is the list of marine mammals found in Australian waters. It is a sub-list of the list of mammals of Australia.
Conservation status listed follows the IUCN red list of threatened species (v. 2013.2; data current at 3 March 2014):
Cetacea
Balaenidae
- Southern right whale, Eubalaena australis LC
Balaenopteridae
- Minke whale, Balaenoptera acutorostrata LC
- Southern minke whale, Balaenoptera bonaerensis DD
- Sei whale, Balaenoptera borealis EN
- Pygmy Bryde's whale, Balaenoptera edeni DD
- Omura's whale, Balaenoptera omurai DD
- Blue whale, Balaenoptera musculus EN (ssp. brevicauda - Pygmy Blue Whale: DD, ssp. intermedia: CR)
- Fin whale, Balaenoptera physalus EN
- Humpback whale, Megaptera novaeangliae LC (Oceania subpopulation: EN)
Delphinidae
- Short-beaked common dolphin, Delphinus delphis LC
- Pygmy killer whale, Feresa attenuata DD
- Short-finned pilot whale, Globicephala macrorhynchus DD
- Long-finned pilot whale, Globicephala melas DD
- Risso's dolphin, Grampus griseus LC
- Fraser's dolphin, Lagenodelphis hosei LC
- Hourglass dolphin, Lagenorhynchus cruciger LC
- Dusky dolphin, Lagenorhynchus obscurus DD
- Southern right whale dolphin, Lissodelphis peronii DD
- Irrawaddy dolphin, Orcaella brevirostris VU
- Australian snubfin dolphin, Orcaella heinsohni NT
- Orca (killer whale), Orcinus orca DD
- Melon-headed whale, Peponocephala electra LC
- False killer whale, Pseudorca crassidens DD
- Indo-Pacific hump-backed dolphin, Sousa chinensis NT
- Pantropical spotted dolphin, Stenella attenuata LC
- Striped dolphin, Stenella coeruleoalba LC
- Spinner dolphin, Stenella longirostris DD
- Rough-toothed dolphin, Steno bredanensis LC
- Indo-Pacific bottlenose dolphin, Tursiops aduncus DD
- Burrunan dolphin, Tursiops australis (T. truncatus: LC, T. aduncus: DD)
- Bottlenose dolphin, Tursiops truncatus LC
Kogiidae
- Pygmy sperm whale, Kogia breviceps DD
- Dwarf sperm whale, Kogia simus DD
Neobalaenidae
- Pygmy right whale, Caperea marginata DD
Phocoenidae
- Spectacled porpoise, Phocoena dioptrica DD
Physeteridae
- Sperm whale, Physeter macrocephalus VU
Ziphiidae
- Arnoux's beaked whale, Berardius arnuxii DD
- Southern bottlenose whale, Hyperoodon planifrons LC
- Longman's beaked whale, Indopacetus pacificus DD
- Andrews' beaked whale, Mesoplodon bowdoini DD
- Blainville's beaked whale, Mesoplodon densirostris DD
- Ginkgo-toothed beaked whale, Mesoplodon ginkgodens DD
- Gray's beaked whale, Mesoplodon grayi DD
- Hector's beaked whale, Mesoplodon hectori DD
- Strap-toothed whale, Mesoplodon layardii DD
- True's beaked whale, Mesoplodon mirus DD
- Shepherd's beaked whale, Tasmacetus shepherdi DD
- Cuvier's beaked whale, Ziphius cavirostris LC
Sirenia
Dugongidae
- Dugong, Dugong dugon VU
Carnivora
Pinnipedia
Otariidae
- New Zealand fur seal, Arctocephalus forsteri LC
- Antarctic fur seal, Arctocephalus gazella LC
- Australian fur seal, Arctocephalus pusillus LC
- Subantarctic fur seal, Arctocephalus tropicalis LC
- Australian sea lion, Neophoca cinerea EN
- New Zealand sea lion, Phocarctos hookeri VU
Phocidae
- Leopard seal, Hydrurga leptonyx LC
- Weddell seal, Leptonychotes weddellii LC
- Crabeater seal, Lobodon carcinophaga LC
- Southern elephant seal, Mirounga leonina LC
- Ross seal, Ommatophoca rossii LC
See also
- List of mammals of Australia
- List of monotremes and marsupials of Australia
- List of bats of Australia
- List of rodents of Australia
- List of placental mammals introduced to Australia