This is an incomplete list of prehistoric mammals. It does not include extant mammals or recently extinct mammals. For extinct primate species, see: list of fossil primates.

Mammaliaformes

Order †Dinnetheria

Order †Siconodontiformes

Order †Morganucodonta

Order †Docodonta

Middle to Late Jurassic

Order †Kuehneotheria

Order †Eutriconodonta

' ' Early Jurassic–Late Cretaceous

Symmetrodonta incertae sedis

Basal Cladotheria

Basal Zatheria

Subclass Yinotheria

Order †Shuotherida

Order †Ausktribosphenida

Order †Henosferida

Order Monotremata

Middle Cretaceous–Recent

Subclass Allotheria

Order †Haramiyida

Order †Multituberculata

Late Jurassic–Eocene

Subclass Theria

Basal Theria

Infraclass †Pantotheria

Order †Spalacotheriida

Order †Meridiolestida

Order †Dryolestida

Order †Amphitheriida

Order †Peramurida

Order †Aegialodontia

Order †Pappotherida

Infraclass Metatheria

Late Cretaceous–Recent

Metatheria incertae sedis

Basal Metatheria

Ameridelphia incertae sedis

Order †Protodelphia

Order †Deltatheroida

Order †Asiadelphia

Order †Alphadontia

Order †Simpsonitheria

Order †Peradectia

Order †Sparassodonta

Order Didelphimorphia

Order Paucituberculata

' '

Order †Polydolopimorphia

Order †Yalkaparidontia

Order Notoryctemorphia

Order Dasyuromorphia

Order Peramelemorphia

Order Microbiotheria

Order Diprotodontia

Infraclass Eutheria

Basal Eutheria

Eutheria incertae sedis

Basal Ungulatomorpha

Order †Asioryctitheria

Order †Didelphodonta

Order †Ptolemaiida

Order †Bibymalagasia

Order Tubulidentata

Order Macroscelidea

Order Afrosoricida

Order Hyracoidea

Oligocene–Recent

Order Sirenia

Eocene–Recent

Order †Embrithopoda

Eocene-Oligocene

Order †Desmostylia

' '

Order Proboscidea

Eocene–Holocene

Order †Leptictida

Order †Cimolesta

Order Eulipotyphla

Late Cretaceous–Recent

Order Dermoptera

Paleocene–Recent

Order Chiroptera

Eocene–Recent

Order Scandentia

Order †Plesiadapiformes

Order Primates

List of fossil primates

Order †Anagalida

Order Lagomorpha

Eocene–Recent

Order Rodentia

Paleocene–Recent

Order †Condylarthra

Note: The "condylarths" are considered paraphyletic, i.e. a grouping of early ungulate-like mammals not necessarily closely related. Paleocene–Eocene

Order †Mesonychia

Order †Litopterna

Paleocene–Pleistocene

Order †Notoungulata

Paleocene–Pleistocene

Suborder Notioprogonia

Suborder Toxodontia

Suborder Typotheria

Suborder Hegetotheria

Order †Astrapotheria

Eocene–Miocene

Order †Xenungulata

Paleogene

Order †Pyrotheria

Eocene–Oligocene

Order †Dinocerata

Eocene–Eocene

Order †Arctostylopida

Order †Creodonta

Paleocene–Late Miocene

Order Carnivora

Paleocene–Recent

Suborder Caniformia (dog-like carnivores)

' '

Suborder Feliformia (cat-like carnivores)

to be sorted

Order Xenarthra (Edentata)

Paleocene–Recent Genus †Protobradys? Ameghino 1902 [Incertae sedis]

Order Pholidota

Eocene–Recent

Infraorder Cetacea

Eocene–Recent Parvorder Archaeoceti

Suborder Mysticeti

to be sorted

Suborder Odontoceti

Order Perissodactyla

Eocene–Recent

Suborder Hippomorpha

Suborder Ceratomorpha

Order Artiodactyla

Eocene–Recent

Suborder Suina

Suborder Tylopoda

Suborder Ruminantia