Rain tree is a common name for several plants and may refer to:
Albizia saman, a tree in the Fabaceae family, native to a range extending from Mexico south to Peru and Brazil
Brunfelsia a genus of shrubs and small trees in the Solanaceae family, native to the tropical Americas
Philenoptera violacea, a tree in the Fabaceae family, native to southern Africa
Golden rain tree, Koelreuteria paniculata