A new species of the genus Boeck, 1876 (Crustacea, Amphipoda, Opisidae) and a new record for from the East Sea, South Korea.

Two species of the opisid genus have been collected from the East Sea of South Korea, one of them described as . The new species, is similar to ; however, it can be clearly distinguished from this species because it has 12 blunt robust setae in the palm of gnathopod 1. The other collected species, Narahara-Nakano, Kakui & Tomikawa, 2016 is previously known from Japanese waters (southeast of Akkeshi Bay, Hokkaido). Both species are illustrated and compared to related species. A key to species is also provided.