The present paper reviews the genus Aidia s.l. (including Anomanthodia and Gynopachis) in Southeast Asia and Malesia. Relationships to Pelagodendron are discussed. The taxonomic variation of characters within the genus is reviewed. In this review 16 new species and 2 new varieties are described, and 14 new species combinations are made in Aidia. Aidiopsis orophila and Fagerlindia canthoides are new combinations in the respective genera. A complete index of names is given.