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
See also Japonica (disambiguation)