Areca mandacanii is a palm in the family Arecaceae. It is native to New Guinea.
Description Areca mandacanii grows up to tall, with a single stem of diameter up to . The crown has eight leaves, each measuring up to long, with a of length. The is up to long, loosely branched. The fruit is dented and measures up to long.
Taxonomy Areca mandacanii was described by Indonesian botanist Charlie Danny Heatubun in Palms in 2008. The holotype was collected in the Maampou Forest of South Sorong Regency in Southwest Papua province. The species is named for Dominggus Mandacan, regent of Manokwari.
Distribution and habitat Areca mandacanii is endemic to western New Guinea, where it is confined to the Maampou Forest on the Bird's Head Peninsula. Its habitat is in areas prone to flooding, between lowland and swamp forests, at an elevation of .
Conservation Areca mandacanii has been assessed as critically endangered on the IUCN Red List. The species is locally used as a betel nut substitute, for which the tree is felled. Coal mining and palm oil plantations are planned in the area, which would further threaten the species.
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