Alstonia iwahigensis is a tree in the dogbane family Apocynaceae.
Alstonia iwahigensis grows as a medium to large-sized tree up to 45m (148feet) tall, with a trunk diameter of up to 100cm (00inches). The bark is greyish, yellowish or dark brown. Its fragrant flowers feature a yellow or pinkish corolla.
Alstonia iwahigensis is native to Borneo and Palawan. The species is found in forests and on hillsides from sea level to 500m (1,600feet) altitude.