Cercidiphyllum japonicum, known as the Katsura (from its Japanese name カツラ, 桂), is a species of flowering tree in the family Cercidiphyllaceae native to China and Japan.

The leaves are produced in opposite pairs on long shoots and singly on short shoots; they have a 1.4–4.7 cm petiole, and are rounded with a heart-shaped base and a crenate margin.

[4][5] The species is listed as endangered in China, but overall when Japanese populations are included C. japonicum is classified as being lower risk.

[6] The Chinese populations were sometimes distinguished in the past as Cercidiphyllum japonicum var.

The following have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017):[7]