Alstonia iwahigensis is a tree in the dogbane family Apocynaceae.

Alstonia iwahigensis grows as a medium to large-sized tree up to 45 metres (150 ft) tall, with a trunk diameter of up to 100 centimetres (40 in).

Its fragrant flowers feature a yellow or pinkish corolla.

[2] Alstonia iwahigensis is native to Borneo and Palawan.

[1] The species is found in forests and on hillsides from sea level to 500 metres (1,600 ft) altitude.