Up to the present, six species of the genus Leptoneta SIMON, 1872, L. coreana, L. hogyegulensis, L. simboggulensis, L. soryongensis, L. yongdamgulensis and L. hongdoensis, have been recorded in Korea. In this paper, the auhors described a new species, L. namhensis, from Namhae-do Isl., Kyeongsangnam-do, Korea. The present species is very similar to L. tsushimensis YAGINUMA, 1970 from Tsushima, Japan, but can be distinguished by the structure of tibial spur of male palp and the number of teeth of fang furrow.