- Jackrabbit
- Jacus wakitai
- jamasakura, Prunus
- Jania, genus
- janthostoma, Cryptonatica
- janthostoma, Natica
- janthostomoides, Cryptonatica
- janthostomoides, Natica
- janthostomoides, Tectonatica
- Japanese alpine cherry
- Japanese ash
- Japanese babylon
- Japanese badger
- Japanese baking scallop
- Japanese basket clam
- Japanese beech
- Japanese bifurcate mussel
- Japanese big leaf magnolia
- Japanese bird cherry
- Japanese black pine
- Japanese blue beech
- Japanese boar
- Japanese bullhead shark
- Japanese bush spruce
- Japanese cherry birch
- Japanese cedar
- Japanese chestnut
- Japanese cockle
- Japanese common catfish
- Japanese conch
- Japanese dace
- Japanese douglas fir
- Japanese dwarf triton
- Japanese eagle ray
- Japanese elm
- Japanese emperor oak
- Japanese evergreen oak
- Japanese false cerith
- Japanese fantail willow
- Japanese fir
- Japanese flowering dogwood
- Japanese geoduck
- Japanese giant flying squirrel
- Japanese hornbeam
- Japanese horse chestnut
- Japanese hydrangea vine
- Japanese kerria
- Japanese knotweed
- Japanese larch
- Japanese linden
- Japanese littleneck
- Japanese macaque
- Japanese maple
- Japanese mock orange
- Japanese moon scallop
- Japanese mugwort
- Japanese oyster
- Japanese pine
- Japanese plum
- Japanese prickly-ash
- Japanese propellor ark
- Japanese red-backed vole
- Japanese red pine
- Japanese rose
- Japanese rowan
- Japanese scallop
- Japanese sea lion
- Japanese spicebush
- Japanese spikenard
- Japanese stuartia
- Japanese tallow tree
- Japanese thuja
- Japanese toad
- Japanese walnut
- Japanese white birch
- Japanese white pine
- Japanese whiting
- Japanese wingnut
- Japanese winterberry
- Japanese wisteria
- Japanese witch hazel
- Japanese wolf
- Japanese yew
- Japelion adelphicus
- Japelion yabei
- japonica, Alnus
- japonica, Ammonia
- japonica, Anthonya
- japonica, Apriona
- japonica, Aria
- japonica, Asamiella
- japonica, Athleta
- japonica, Atrina
- japonica, Babylonia
- japonica, Barnea
- japonica, Benthamidia
- japonica, Berberis amurensis
- japonica, Brevimyurella
- japonica, Buxus microphylla
- japonica, Camptopteris
- japonica, Carpolithes
- japonica, Cassidulina
- japonica, Ceratostoma
- japonica, Chaenomeles
- japonica, Charybdis
- japonica, Cipangopaludina
- japonica, Cocculina
- japonica, Comptonia
- japonica, Corbicula
- japonica, Cryptomeria
- japonica, Culicia
- japonica, Cyclammina
- japonica, Cyclina
- japonica, Cyphastrea
- japonica, Cyrtocapsella
- japonica, Dosinia
- japonica, Enida
- japonica, Eusilpha
- japonica, Fagus
- japonica, Fallopia
- japonica, Fraxinus
- japonica, Fraxinus mandshurica
- japonica, Ginebis
- japonica, Gleditsia
- japonica, Haliotis
- japonica, Hamamelis
- japonica, Heteropsammia ovalis
- japonica, Islandiella
- japonica, Kerria
- japonica, Ladinocampe
- japonica, Larix gmelinii
- japonica, Leperditia
- japonica, Lepidocyclina
- japonica, Letepsammia
- japonica, Lobophyllia
- japonica, Marcia
- japonica var. megaphylla, Hamamelis
- japonica, Megayoldia
- japonica, Metasequoia
- japonica, Micrabacia
- japonica, Molobratia
- japonica, Mya
- japonica, Myadora
- japonica, Myophoria
- japonica, Naticella
- japonica, Neoshirakia
- japonica, Nephrolepidina
- japonica, Nihonotrypaea
- japonica nomurai, Dosinia
- japonica, Nonionella
- japonica, Notophyllia
- japonica ssp. obtusata, Hamamelis
- japonica, Operculina
- japonica, Operculina complanata
- japonica, Panopea
- japonica, Parafusulina
- japonica, Pectinia lactuca
- japonica, Potamides yokoyamai
- japonica, Pseudofusulina
- japonica, Pseudolarix
- japonica, Pseudoliva
- japonica, Pseudotsuga
- japonica, Reticunassa
- japonica, Reynoutria
- japonica, Schwagerina
- japonica, Searlesia
- japonica, Sequoia
- japonica, Sillago
- japonica, Sorbus
- japonica, Taiwania
- japonica, Tapes
- japonica, Terebra
- japonica, Terebratulina
- japonica, Tilia
- japonica, Trapa
- japonica, Tridacophyllia lactuca
- japonica, Tritia
- japonica, Ulmus davidiana
- japonica, Umitakea
- japonica, Vicarya
- japonica, Vicarya callosa
- japonica, Vicarya yokoyamai
- japonica, Yaadia
- japonica, Yeharaia
- japonicum, Acer
- japonicum, Brachyphyllum
- japonicum, Canarium
- japonicum, Cercidiphyllum
- japonicum, Dadoxylon
- japonicum, Desmoceras
- japonicum, Dictyophyllum
- japonicum, Epitonium
- japonicum, Eutrephoceras
- japonicum, Mantelliceras
- japonicum, Meekoceras
- japonicum, Nonion
- japonicum, Otostoma
- japonicum, Pachycrommium
- japonicum, Pseudohaploceras
- japonicum, Pseudononion
- japonicum, Pseudouhligella
- japonicum, Phacosoma
- japonicum, Sapium
- japonicum, Strioterebrum
- japonicus, Actinocyathus
- japonicus, Anatolikos
- japonicus, Anourosorex
- japonicus, Bufo
- japonicus, Cervus
- japonicus, Cervus (Axis)
- japonicus, Cheirurus
- japonicus, Chuhsiungichthys
- japonicus, Cordaites
- japonicus crassicostatus, Hollandites
- japonicus, Crotalocephalus
- japonicus, Danubites
- japonicus, Desmostylus
- japonicus, Doxander
- japonicus, Heterocyathus
- japonicus, Heterodontus
- japonicus, Hollandites
- japonicus, Humulus
- japonicus, Inoceramus
- japonicus, Linuparus
- japonicus, Macrophthalmus
- japonicus, Mallotus
- japonicus, Mareotis
- japonicus, Nassarius
- japonicus, Orthaulax
- japonicus, Pitar
- japonicus, Schizodus
- japonicus, Strombus
- japonicus, Styrax
- japonicus, Tectus
- japonicus, Tulotomoides
- japonicus, Zalophus
- Japonocapsa fusiformis
- Japonocetus akishimensis
- Javelin turrid