Buxus microphylla (Japanese box or littleleaf box) is a species of Buxus native to Japan and Taiwan. It is an evergreen shrub or small tree growing to 2–3 metres (6 ft 7 in–9 ft 10 in) tall. The leaves are bright green, 10–25 millimetres (0.39–0.98 in) long, oval with a rounded or notched tip. Plants from Taiwan are distinguished as Buxus microphylla var. tarokoensis S.Y.Lu & Y.P.Yang. Plants from China and Korea formerly often cited as Buxus microphylla var. sinica are now treated as a distinct species Buxus sinica.