Mammals in Western Australia include both native and introduced species.^[1]

• Family: Tachyglossidae
  • Genus: Tachyglossus
    • Short-beaked echidna, T. aculeatus LC

• Family: Dasyuridae
  • Subfamily: Dasyurinae
    • Tribe: Dasyurini
      • Genus: Dasycercus
        • Brush-tailed mulgara, D. blythi LC
        • Crest-tailed mulgara, D. cristicauda LC
      • Genus: Dasykaluta
        • Little red kaluta, D. rosamondae LC
      • Genus: Dasyurus
        • Western quoll, D. geoffroii NT
        • Northern quoll, D. hallucatus EN
      • Genus: Parantechinus
        • Dibbler, P. apicalis EN
      • Genus: Pseudantechinus
        • Fat-tailed false antechinus, P. macdonnellensis LC
        • Ningbing false antechinus, P. ningbing LC
        • Rory Cooper's false antechinus, P. roryi LC
        • Woolley's false antechinus, P. woolleyae LC
    • Tribe: Phascogalini
      • Genus: Antechinus
        • Yellow-footed antechinus, A. flavipes LC
      • Genus: Phascogale
        • Red-tailed phascogale, P. calura NT
        • Brush-tailed phascogale, P. tapoatafa NT
  • Subfamily: Sminthopsinae
    • Tribe: Planigalini
      • Genus: Planigale
        • Long-tailed planigale, P. ingrami LC
        • Common planigale, P. maculata LC
    • Tribe: Sminthopsini
      • Genus: Antechinomys
        • Kultarr, A. laniger LC
      • Genus: Ningaui
        • Wongai ningaui, N. ridei LC
        • Pilbara ningaui, N. timealeyi LC
        • Southern ningaui, N. yvonneae LC
      • Genus: Sminthopsis
        • Carpentarian dunnart, S. butleri VU
        • Fat-tailed dunnart, S. crassicaudata LC
        • Little long-tailed dunnart, S. dolichura LC
        • Gilbert's dunnart, S. gilberti LC
        • White-tailed dunnart, S. granulipes LC
        • Grey-bellied dunnart, S. griseoventer LC
        • Hairy-footed dunnart, S. hirtipes LC
        • Long-tailed dunnart, S. longicaudata LC
        • Stripe-faced dunnart, S. macroura LC
        • Ooldea dunnart, S. ooldea LC
        • Sandhill dunnart, S. psammophila EN
        • Red-cheeked dunnart, S. virginiae LC
        • Lesser hairy-footed dunnart, S. youngsoni LC
• Family: Myrmecobiidae
  • • • Genus: Myrmecobius
        • Numbat, M. fasciatus EN

• Family: Chaeropodidae
  • Genus: Chaeropus
    • Pig-footed bandicoot, Chaeropus ecaudatus EX
• Family: Peramelidae
  • Genus: Isoodon
    • Golden bandicoot, Isoodon auratus VU
    • Northern brown bandicoot, Isoodon macrourus LC
    • Southern brown bandicoot, Isoodon obesulus LC
  • Genus: Perameles
    • Western barred bandicoot, Perameles bougainville EN
    • Desert bandicoot, Perameles eremiana EX
• Family: Thylacomyidae
  • Genus: Macrotis
    • Greater bilby, Macrotis lagotis VU
    • Lesser bilby, Macrotis leucura EX

• Family: Notoryctidae
  • Genus: Notoryctes
    • Northern marsupial mole, Notoryctes caurinus DD
    • Southern marsupial mole, Notoryctes typhlops DD

• Suborder: Macropodiformes
  • Family: Potoroidae
    • Genus: Bettongia
• Burrowing bettong, Bettongia lesueur
• Woylie, Bettongia penicillata)
• Gilbert's potoroo, Potorous gilbertii endemic
• Broad-faced potoroo, Potorous platyops EX

• Central hare-wallaby, Lagorchestes asomatus
• Spectacled hare-wallaby, Lagorchestes conspicillatus
• Mala, Lagorchestes hirsutus
• Banded hare-wallaby, Lagostrophus fasciatus endemic
• Western grey kangaroo, Macropus fuliginosus
• Agile wallaby, Notamacropus agilis
• Tammar wallaby, Notamacropus eugenii
• Western brush wallaby, Notamacropus irma endemic
• Crescent nail-tail wallaby, Onychogalea lunata EX
• Northern nail-tail wallaby, Onychogalea unguifera
• Antilopine wallaroo, Osphranter antilopinus
• Common wallaroo, Osphranter robustus
• Red kangaroo, Osphranter rufus
• Short-eared rock-wallaby, Petrogale brachyotis
• Monjon, Petrogale burbidgei
• Nabarlek, Petrogale concinna
• Black-flanked rock-wallaby, Petrogale lateralis
• Rothschild's rock-wallaby, Petrogale rothschildi endemic
• Quokka, Setonix brachyurus - endemic

• Common brushtail possum, Trichosurus vulpecula
• Scaly-tailed possum, Wyulda squamicaudata endemic

• Savanna glider, Petaurus ariel

• Rock ringtail possum, Petropseudes dahli
• Western ringtail possum, Pseudocheirus occidentalis endemic

• Western pygmy possum, Cercartetus concinnus

• Honey possum, Tarsipes rostratus endemic
• Suborder: Vombatiformes
  • Family: Vombatidae
    • Genus: Lasiorhinus
      • Southern hairy-nosed wombat, Lasiorhinus latifrons LC

• Northern blossom-bat, Macroglossus minimus
• Black flying fox, Pteropus alecto
• Little red flying-fox, Pteropus scapulatus

• Ghost bat, Macroderma gigas

• Dusky leaf-nosed bat, Hipposideros ater
• Northern leaf-nosed bat, Hipposideros stenotis
• Orange leaf-nosed bat, Rhinonicteris aurantius

• Yellow-bellied sheath-tailed bat, Saccolaimus flaviventris
• Common sheath-tailed bat, Taphozous georgianus
• Hill's sheath-tailed bat, Taphozous hilli

• Gould's wattled bat, Chalinolobus gouldii
• Chocolate wattled bat, Chalinolobus morio
• Hoary wattled bat, Chalinolobus nigrogriseus
• Western false pipistrelle, Falsistrellus mackenziei endemic
• Common bent-wing bat, Miniopterus schreibersii
• Large-footed bat, Myotis moluccarum
• Arnhem long-eared bat, Nyctophilus arnhemensis
• Northwestern long-eared bat, Nyctophilus bifax
• Lesser long-eared bat, Nyctophilus geoffroyi
• Gould's long-eared bat, Nyctophilus gouldi
• Greater long-eared bat, Nyctophilus timoriensis
• Pygmy long-eared bat, Nyctophilus walkeri
• Northern pipistrelle, Pipistrellus westralis
• Inland broad-nosed bat, Scotorepens balstoni
• Little broad-nosed bat, Scotorepens greyii
• Northern broad-nosed bat, Scotorepens sanborni
• Inland forest bat, Vespadelus baverstocki
• Northern cave bat, Vespadelus caurinus
• Yellow-lipped cave bat, Vespadelus douglasorum endemic
• Finlayson's cave bat, Vespadelus finlaysoni
• Southern forest bat, Vespadelus regulus

• Northern freetail bat, Chaerephon jobensis
• Beccari's free-tailed bat, Mormopterus beccarii
• Little northern freetail bat, Mormopterus loriae
• Southern free-tailed bat, Mormopterus planiceps
• White-striped free-tailed bat, Tadarida australis

• Rio Negro brush-tailed rat, Conilurus penicillatus
• Rakali, Hydromys chrysogaster
• Forrest's mouse, Leggadina forresti
• Short-tailed hopping mouse, Leggadina lakedownensis
• Lesser stick-nest rat, Leporillus apicalis EX
• Greater stick-nest rat, Leporillus conditor
• Grassland melomys, Melomys burtoni
• Black-footed tree-rat, Mesembriomys gouldii
• Golden-backed tree-rat, Mesembriomys macrurus
• House mouse, Mus musculus - naturalised exotic
• Spinifex hopping mouse, Notomys alexis
• Long-tailed hopping mouse, Notomys longicaudatus EX
• Big-eared hopping mouse, Notomys macrotis EX
• Mitchell's hopping mouse, Notomys mitchelli
• Ash-grey mouse, Pseudomys albocinereus
• Plains rat, Pseudomys australis
• Bolam's mouse, Pseudomys bolami
• Western pebble-mound mouse, Pseudomys chapmani endemic
• Little native mouse, Pseudomys delicatulus
• Desert mouse, Pseudomys desertor
• Shark Bay mouse, Pseudomys fieldi
• Sandy inland mouse, Pseudomys hermannsburgensis
• Kimberley mouse, Pseudomys laborifex
• Western chestnut mouse, Pseudomys nanus
• Western mouse, Pseudomys occidentalis - endemic
• Heath mouse, Pseudomys shortridgei
• Pacific rat, Rattus exulans introduced
• Bush rat, Rattus fuscipes
• Brown rat, Rattus norvegicus introduced
• Black rat, Rattus rattus introduced
• Pale field rat, Rattus tunneyi
• Long-haired rat, Rattus villosissimus
• Common rock rat, Zyzomys argurus
• Central rock rat, Zyzomys pedunculatus
• Kimberley rock rat, Zyzomys woodwardi endemic

• Indian palm squirrel, Funambulus pennanti introduced

• European rabbit, Oryctolagus cuniculus introduced

• Dugong, Dugong dugon

• Southern right whale, Eubalaena australis

• Dwarf minke whale, Balaenoptera acutorostrata
• Antarctic minke whale, Balaenoptera bonaerensis
• Sei whale, Balaenoptera borealis
• Bryde's whale, Balaenoptera edeni
• Blue whale, Balaenoptera musculus
• Fin whale, Balaenoptera physalus
• Humpback whale, Megaptera novaeangliae

• Pygmy right whale, Caperea marginata

• Sperm whale, Physeter macrocephalus

• Pygmy sperm whale, Kogia breviceps
• Dwarf sperm whale, Kogia sima

• Arnoux's beaked whale, Berdius arnuxii
• Southern bottlenose whale, Hyperoodon planifrons
• Andrews' beaked whale, Mesoplodon bowdoini
• Blainville's beaked whale, Mesoplodon densirostris
• Gray's beaked whale, Mesoplodon grayi
• Hector's beaked whale, Mesoplodon hectori
• Strap-toothed whale, Mesoplodon layardi
• True's beaked whale, Mesoplodon mirus
• Shepherd's beaked whale, Tasmancetus shepherdi
• Cuvier's beaked whale, Ziphius cavirostris

• Short-beaked common dolphin, Delphinus delphis
• Pygmy killer whale, Feresa attenuata
• Short-finned pilot whale, Globicephala macrorhynchus
• Long-finned pilot whale, Globicephala melas
• Risso's dolphin, Grampus griseus
• Fraser's dolphin, Lagenodelphis hosei
• Southern right whale dolphin, Lissadelphis peronii
• Australian snubfin dolphin, Orcaella heinsohni
• Killer whale, Orcinus orca
• Melon-headed whale, Peponocephala electra
• False killer whale, Pseudorca crassidens
• Indo-Pacific humpback dolphin, Sousa chinensis
• Spotted dolphin, Stenella attenuata
• Striped dolphin, Stenella coeruleoalba
• Spinner dolphin, Stenella longirostris
• Rough-toothed dolphin, Steno bredanensis
• Indo-Pacific bottlenose dolphin, Tursiops aduncus
• Bottlenose dolphin, Tursiops truncatus

• New Zealand fur seal, Arctophoca forsteri
• Subantarctic fur seal, Arctophoca tropicalis
• Australian sea lion, Neophoca cinerea

• Leopard seal, Hydrurga leptonyx
• Crabeater seal, Lobodon carcinophagus
• Southern elephant seal, Mirounga leonina

• Dingo, Canis familiaris dingo
• Red fox, Vulpes vulpes introduced

• Common fallow deer, Dama dama introduced