Xylosma crenata, the sawtooth logwood, is a species of flowering plant in the willow family, Salicaceae, that is endemic to the island of Kauaʻi in Hawaii. It is a tree, reaching a height of 46 ft (14 m). Sawtooth logwood inhabits montane mesic forests dominated by koa (Acacia koa) and ʻōhiʻa lehua (Metrosideros polymorpha) at elevations of 975–1,065 m (3,199–3,494 ft). It is threatened by habitat loss.