Sahulia suboppositifolia (Sapotaceae, Chrysophylloideae) is described and illustrated as a new monotypic genus from New Guinea. The species is so far only known from four collections made in lowland tropical rainforest near Lake Murray in the west and Koitaki east of Port Moresby. As a member of Sapotaceae with white latex, entire leaves, and flowers in fascicles, it is readily distinguished by the combination of opposite leaves, non-areolate venation, and almost 10 mm long green flowers with a bristle-like corolla margin consisting of short, rather thick, and pointing trichomes. We also provide a new generic key to Sapotaceae for New Guinea.