O. japonica
# O. japonica

O. japonica may refer to:

* Obesotoma japonica, a sea snail species
* Olivella japonica, a sea snail species
* Orixa japonica, a shrub of Japan and Korea
* Osmunda japonica, the Japanese royal fern or Japanese flowering fern, a fern species native to eastern Asia, including Japan, China, Korea, Taiwan and the far east of Russia on Sakhalin
* Ostrya japonica, the Japanese hop-hornbeam, a tree species native to Japan, Korea and China
