Samoana decussatula, common name the "Polynesian tree snail", is a species of tropical, air-breathing land snail, a terrestrial, pulmonate, gastropod mollusc in the family Partulidae.

This species is endemic to Hiva Oa, Marquesas Islands, French Polynesia.

It has also been recorded from the neighbouring island of Tahuata, but its presence there has not been confirmed.

[1] polynesian-tree-snail/samoana-decussatula Polynesian tree snail (Samoana decussatula) media from ARKive

This Partulidae-related article is a stub.