, Galago
, Galagoides
, Galagonidae
, Galea
, Galemys
, Galenomys
, Galeopterus
, Galerella
, Galictis
, Galidia
, Galidictis
, Gazella
, Genetta
, Geocapromys
, Geogale
, Geomyidae
, Geomys
, Georychus
, Geoxus
, Gerbillurus
, Gerbillus
- †Gigantopithecus bilaspurensis Simons and Ettel 1970 [1]
- †Gigantopithecus blacki von Koenigswald, 1935† [2]
- †Gigantopithecus giganteus (Pilgrim, 1915) [1]
Mammalia → Primates → Hominoidea → Hominidae → Ponginae → Sivapithecini
, Giraffa
, Giraffidae
, Glaucomys
- Aspalacidae Gray 1825
- Duplicidentata Illiger 1811
- †Eurymylidae Matthew et al. 1929
- Ierboidae Gray 1825
- †Mixodontia Sych 1971
- Rodentia Bowditch 1821
- Simplicidentata Flower 1883
- †Sinomylus McKenna and Meng 2001
Animalia → Chordata → Mammalia → Placentalia → Euarchontoglires
, Glironia
, Glirulus
, Glischropus
, Globicephala
, Glossophaga
, Glyphotes
- †Gobiconodon Trofimov 1978
- †Hangjinia Godefroit and Guo 1999
- †Huasteconodon Montellano et al. 2008
- †Meemannodon Meng et al. 2005
- †Repenomamus Li et al. 2000
- †Spinolestes Martin et al. 2015
Mammalia → Eutriconodonta
- †Gobiolagus aliwusuensis Fostowicz-Frelik et al. 2012
- †Gobiolagus burkei Meng et al. 2005
- †Gobiolagus gromovi Erbajeva 1999
- †Gobiolagus hekkeri Shevyreva 1995
- †Gobiolagus lii Zhang et al. 2001
- †Gobiolagus major Burke 1941
- †Gobiolagus tolmachovi Burke 1941 tipična
Mammalia → Lagomorpha → Leporidae
, Golunda
, Gorilla
, Gracilinanus
, Grammomys
, Grampus
, Graomys
, Graphiurus
, Gulo
, Gymnobelideus
, Gymnuromys