The Long-billed Green Sunbird (Cinnyris notatus) is a species of bird in the Nectariniidae family. It has been placed in the genus Nectarinia. It is found in Comoros, Madagascar, and Mayotte. The taxon moebii, by most authorities considered a subspecies of the Long-billed Green Sunbird, has occasionally been considered a separate species, the Comoro Green Sunbird (Cinnyris moebii). Its natural habitats are subtropical or tropical dry forests, subtropical or tropical moist lowland forests, subtropical or tropical mangrove forests, and subtropical or tropical moist montanes.