Sapindus (Sapindaceae) contains about 10-20 species of trees which are well known for their soap-making properties and the utility of their hard, spheroidal endocarps for ornament or games. Section Sapindus has the most wide-ranging distrubition within the genus, probably partly due to oceanic hydrochory; this section is native to the Americas, Asia, Melanesia, and Polynesia. Most modern treatments have recognized around 3-5 species in sect. Sapindus (here provisionally including two species from Vietnam), with the name S. saponaria being applied nearly throughout the distribution of this section. Undertaking a revision of Sapindus sect. Sapindus, ca. 700 herbarium specimens were physically examined and several hundred digital images of herbarium specimens were studied. Four species were studied in cultivation and field work was conducted in Florida. Within sect. Sapindus, 13 species are recognized, including two new combinations and two newly described species. The application of Sapindus saponaria is clarified, as a primarily Neotropical speces.