A new species, Stenommatus insularis Legalov, sp. nov. from Bacan Isl. (Indonesia: Maluku Islands) is described and illustrated. This new species is similar to S. telnovi Legalov, 2022 from New Guinea but differs in the larger body size, wider elytra, more roughly punctured pronotum, and thicker antennal scape. It is the first record of the genus Stenommatus from Maluku Islands.