Annam tree frog (Hyla simplex), also known as the South China tree toad, is a species of frog in the family Hylidae. It is found in southern China, Vietnam, and Laos. The Hainan tree toad (H. s. hainanensis) from Hainan Island is treated as a subspecies.

Male Annam tree frogs grow to a snout–vent length of about 37 mm (1.5 in) and females to 40 mm (1.6 in). Tadpoles are up to 32 mm (1.3 in) in length.

Annam tree frogs are a common, arboreal species living in montane areas, including fields, bamboo forests and shrubland. Breeding takes place in rice paddies and in permanent pools. It is potentially threatened by habitat degradation.

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