A new species belonging to the genus Ctenobelba Balogh, 1943, is described from Korea. The new species, Ct. leei sp. n., closely resembles Ct. longisetosa Suzuoka and Aoki, 1980 from Japan. However, the Japanese species Ct. longisetosa differs by 1) the large body size ($770-797;{mu}m$ in length, $455-468;{mu}m$ in width as opposed to the rather small size with $520-600;{mu}m$ long and $264-362;{mu}m$ wide, 2) a pair of notogastral condyles on the anterior margin of notogaster as opposed to two pairs of notogastral condyles, 3) three pectinations on sensillus as opposed to 6-9 pectinations, 4) the setal formula of epimerata 3-1-4-4 as opposed to the 3-1-3-3, and 5) the glabrous anal setae as opposed to barbed from the present new species. A key to the hitherto known species of the longisetosa-group belonging to the genus Ctenobelba Balogh, 1943 is given.