Sebastiania is a genus of flowering plants in the family Euphorbiaceae first described in 1821. It is native to North and South America from Arizona and the West Indies south to Uruguay.Species include:
Many species formerly in Sebastiana have been moved to other genera, including: Actinostemon, Bonania, Chrysanthellum, Dendrocousinsia, Ditaxis, Ditrysinia, Gymnanthes, Microstachys, Phyllanthus, Sapium, and Stillingia.