C. japonica

C. japonica may refer to:
 * Caenorhabditis japonica, a nematode species
 * Caligula japonica, the Japanese giant silkworm, a moth species found in Eastern Asia, including China, Korea, Japan and Russia
 * Callicarpa japonica, the Japanese beautyberry, a tree species native to Japan
 * Calostoma japonica, a mushroom species
 * Camellia japonica, the Japanese camellia, a flowering shrub or a small tree species native to Japan, Korea and China
 * Carex japonica, a perennial sedge species
 * Carpinus japonica, a plant species in the genus Carpinus
 * Cayratia japonica, the bushkiller, Yabu Garashi and Japanese cayratia herb, a herbaceous plant species native to Australia and Asia
 * Chaenomeles japonica, the Kusa-boke, a deciduous shrub species
 * Chalcophora japonica, the ubatamamushi or flat-headed wood-borer, a metallic, bullet-shaped, woodboring beetle species endemic to Japan
 * Charybdis japonica, a swimming crab species found in the waters near Japan
 * Cheilosia japonica, a hoverfly species in the genus Cheilosia
 * Cheilotrichia japonica, a crane fly species in the genus Cheilotrichia
 * Chionographis japonica, a herbaceous plant species in the genus Chionographis
 * Cicindela japonica, the Japanese tiger beetle, a ground beetle species native to Asia
 * Citrus japonica, the kumquat, a small fruit-bearing tree species
 * Cladura japonica, a crane fly species in the genus Cladura
 * Cleyera japonica, the sakaki, a flowering evergreen tree or shrub species native to Japan, Korea and China
 * Collinsonia japonica, a flowering plant species in the genus Collinsonia
 * Collodiscula japonica, a fungus species
 * Coturnix japonica, the Japanese quail, a bird species found in East Asia
 * Croomia japonica, a primitive angiosperm herb species found in Japan
 * Cryptomeria japonica, the sugi or Japanese cedar, a conifer species endemic to Japan
 * Cryptotaenia japonica, a herbaceous perennial plant species
 * Cuscuta japonica, the Japanese dodder, a parasitic vine species
 * Cylindrotoma japonica, a crane fly species in the genus Cylindrotoma

Synonyms

 * Caridina japonica, a synonym for Caridina multidentata, a shrimp species found in Japan, Korea and Taiwan
 * Celtis japonica, a synonym for Celtis sinensis, the Chinese hackberry, a flowering plant species native to slopes in East Asia
 * Cephalanthera japonica, a synonym for Cephalanthera falcata, the golden orchid, an orchid species
 * Cerasus japonica, a synonym for Prunus japonica, the Korean cherry, flowering almond or Oriental bush cherry, a shrub species
 * Cupressus japonica, a synonym for Cryptomeria japonica, the sugi or Japanese cedar, a conifer species endemic to Japan