Partula tristis

{{Short description|Species of gastropod}}

{{Use dmy dates|date=May 2017}}

{{Speciesbox

| image =

| status = EX | status_system = IUCN3.1

| status_ref = {{cite iucn |author=Gerlach, J. |date=2024 |title=Partula tristis |volume=2024 |page= e.T16330A112362293 |access-date=29 July 2024}}

| taxon = Partula tristis

| authority = Crampton & Cooke, 1953

| synonyms =

}}

Partula tristis is a species of air-breathing tropical land snail, a terrestrial pulmonate gastropod mollusk in the family Partulidae. This species was endemic to Ra'iātea, French Polynesia. It is now extinct. It is informally known as the mournful tree snail.{{Cite web | url=https://islandbiodiversity.com/tristis.htm | title=The similar Partula tristis}}