B. japonica

B. japonica may refer to:
 * Balanophora japonica, a plant species
 * Barnardia japonica, a bulbous flowering plant species
 * Blera japonica, a hoverfly species
 * Bombycilla japonica, the Japanese Waxwing, a fairly small passerine bird species found in north-east Asia
 * Buddleja japonica, a plant species found in Honshu and Shikoku, Japan
 * Buergeria japonica, the Ryukyu Kajika Frog or Ryukyu Kajikagaeru, a frog species found in Japan and Taiwan