Fatsia japonica (fatsi, paperplant or Japanese aralia; syn. Aralia japonica Thunb., A. sieboldii Hort. ex K.Koch) is a species of flowering plant in the family Araliaceae, native to southern Japan and South Korea.

It is an evergreen shrub growing to 3–6 m (9.8–19.7 ft) tall, with stout, sparsely branched stems. The leaves are spirally-arranged, large, 20–50 cm (7.9–19.7 in) in width and on a petiole up to 50 cm (20 in) long, leathery, palmately lobed, with 7–9 broad lobes, divided to half or two-thirds of the way to the base of the leaf; the lobes are edged with coarse, blunt teeth. The flowers are small, white, borne in dense terminal compound umbels in late autumn or early winter, followed by small black fruit.