Rhacophorus annamensis (Annam flying frog) is a species of frog in the family Rhacophoridae found in the Annamite Mountains in Cambodia and Vietnam. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and rivers. It is threatened by habitat loss. The females of this species are somewhat larger, at around 4.0 in (10 cm). This frog is usually a light gray color, but can also be brown or a dark red color, and in some cases bright yellow.