Gonystylus maingayi is a tree in the family Thymelaeaceae.
Gonystylus maingayi grows as a tree up to tall, with a trunk diameter of up to 80cm (30inches). Its bark is grey to brown. The fruit is round, dark brown, up to 4cm (02inches) in diameter.
Gonystylus maingayi is native to Sumatra, Peninsular Malaysia, Singapore and Borneo. Its habitat is swamp forests to 290m (950feet) altitude.