Alstonia longifolia is a plant species in the genus Alstonia, family Apocynaceae.

It is native to southern Mexico and Guatemala at an elevation of 1400–1800 m.[3] This is a tree up to 11 m (36 ft) tall.

It is distinguished from related species by its corolla tube 7–10 mm (0.28–0.39 in) long, with obovate lobes 4 mm–6 mm × 2 mm–3 mm (0.157 in–0.236 in × 0.079 in–0.118 in).

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