Between brackets is the number of accepted extant species
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- Decapoda (17 688)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 155)
- Infraorder Achelata (153)
- Infraorder Anomura (3 416)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 884)
- Section Callichimaeroida †
- Section Cyclodorippoida (110)
- Section Dakoticancroida †
- Section Dromiacea (189)
- Section Etyoida †
- Section Eubrachyura (7 447)
- Subsection Heterotremata (6 087)
- Superfamily Aethroidea Dana, 1851 (37)
- Superfamily Bellioidea Dana, 1852 (7)
- Superfamily Bythograeoidea Williams, 1980 (16)
- Superfamily Calappoidea De Haan, 1833 (103)
- Superfamily Cancroidea Latreille, 1802 (37)
- Family Atelecyclidae Ortmann, 1893 (3)
- Family Cancridae Latreille, 1802 (34)
- Subfamily Cancrinae Latreille, 1802 (34)
- Genus Acanthodes De Haan, 1835 accepted as Hypothalassia Gistel, 1848
- Genus Anatolikos Schweitzer & Feldmann, 2000 (2)
- Species Anatolikos fujinaensis (Sakumoto, Karasawa & Takayasu, 1992) †
- Species Anatolikos itoigawa (Karasawa, 1990) †
- Species Anatolikos japonicus (Ortmann, 1893)
- Species Anatolikos tomowoi (Karasawa, 1990) †
- Species Anatolikos tumifrons (Yokoya, 1933)
- Species Anatolikos undecimspinosus Schweitzer, Feldmann, González-Barba & Ćosović, 2006 †
- Genus Anisospinos Schweitzer & Feldmann, 2000 †
- Genus Cancer Linnaeus, 1758 (9)
- Genus Ceronnectes De Angeli & Beschin, 1998 †
- Genus Glebocarcinus Nations, 1975 (3)
- Genus Metacarcinus A. Milne-Edwards, 1862 (5)
- Genus Microdium Reuss, 1867 †
- Genus Mizuhocancer Karasawa in Karasawa & Takahashi, 2020 †
- Genus Notocarcinus Schweitzer & Feldmann, 2000 †
- Genus Platepistoma Rathbun, 1906 (8)
- Genus Romaleon Gistel, 1848 (7)
- Genus Santeecarcinus Blow & Manning, 1996 †
- Genus Sarahcarcinus Blow & Manning, 1996 †
- Subfamily Lobocarcininae Buerlen, 1930 †
- Genus Cyclocancer Beurlen, 1958 † accepted as Hepatus Bosc, 1801
- Genus Platycarcinus H. Milne Edwards, 1834 accepted as Cancer Linnaeus, 1758
- Genus Rama Beschin, Busulini, Tessier & Zorzin, 2016 † accepted as Ramacarcinus De Angeli & Ceccon, 2017 †
- Genus Trichocarcinus Miers, 1879 accepted as Romaleon Gistel, 1848
- Genus Trichocera De Haan, 1833 accepted as Romaleon Gistel, 1848
- Family Lobocarcinidae Beurlen, 1930 † accepted as Lobocarcininae Buerlen, 1930 †
- Family Montezumellidae Ossó & Domínguez, 2013 † accepted as Montezumellidae Ossó & Domínguez, 2021 †
- Superfamily Carpilioidea Ortmann, 1893 (3)
- Superfamily Cheiragonoidea Ortmann, 1893 (3)
- Superfamily Componocancroidea Feldmann, Schweitzer & Green, 2008 †
- Superfamily Corystoidea Samouelle, 1819 (9)
- Superfamily Dairoidea Serène, 1965 (4)
- Superfamily Dorippoidea MacLeay, 1838 (100)
- Superfamily Eriphioidea MacLeay, 1838 (67)
- Superfamily Gecarcinucoidea Rathbun, 1904 (458)
- Superfamily Goneplacoidea MacLeay, 1838 (238)
- Superfamily Heterotremata incertae sedis †
- Superfamily Hexapodoidea Miers, 1886 (44)
- Superfamily Hymenosomatoidea MacLeay, 1838 (138)
- Superfamily Leucosioidea Samouelle, 1819 (516)
- Superfamily Majoidea Samouelle, 1819 (968)
- Superfamily Montezumelloidea Ossó & Domínguez, 2021 †
- Superfamily Orithyioidea Dana, 1852 (1)
- Superfamily Palicoidea Bouvier, 1898 (69)
- Superfamily Parthenopoidea MacLeay, 1838 (148)
- Superfamily Pilumnoidea Samouelle, 1819 (440)
- Superfamily Portunoidea Rafinesque, 1815 (476)
- Superfamily Potamoidea Ortmann, 1896 (956)
- Superfamily Pseudocarcinoidea Ng & Davie, 2020 (1)
- Superfamily Pseudothelphusoidea Ortmann, 1893 (301)
- Superfamily Pseudozioidea Alcock, 1898 (27)
- Superfamily Retroplumoidea Gill, 1894 (10)
- Superfamily Thioidea Dana, 1852 accepted as Thiidae Dana, 1852
- Superfamily Trapezioidea Miers, 1886 (58)
- Superfamily Trichodactyloidea H. Milne Edwards, 1853 (52)
- Superfamily Trichopeltarioidea Tavares & Cleva, 2010 (29)
- Superfamily Xanthoidea MacLeay, 1838 (771)
- Subsection Thoracotremata (1 360)
- Section Homoloida (91)
- Section Podotremata accepted as Brachyura
- Section Raninoida (47)
- Section Torynommoida †
- Family Brachyura incertae sedis
- Family Cretapsaridae Luque in Luque, Xing, Briggs, Clark, Duque, Hui, Mai & McKellar, 2021 †
- Family Montemagrechiridae Klompmaker, Portell & van der Meij, 2016 †
- Genus Psammograpsus A. Milne-Edwards, 1860 †
- Genus Zoea Bosc, 1801
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 920)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (101)
- Suborder Reptantia
- Suborder Trichelida