Rhacophorus reinwardtii is a species of frog in the family Rhacophoridae. It is variously known under the common names of black-webbed tree frog, green flying frog, or Reinwardt’s tree frog. It is found in China, Indonesia, Laos, Malaysia, Thailand, and Vietnam, and possibly Brunei and Myanmar. Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, freshwater marshes, and intermittent freshwater marshes. It is not considered threatened by the IUCN.
The females grow to be larger than the males, to a length of 3.5 in (8.9 cm). They can be either light green or dark green colors and they have black spots around their backs and heads. Males can have more colors on the sides of their abdomens, such as orange, green, purple, black, and yellow. Their eyes can be light green, light yellow or light grey. They have horizontal pupils.