A new species of the genus Onychiurus is described from Korea(Jeoksang Mountain in Muju). The genus Onychiurus was elected by Gervais in 1841 with type species Podura ambulans Linneus, 1758. 49 specis of Onychiurus have been reported worldwide, of which only one species, O. polychaetosus, have been recorded from Korea. This genus is characterized by postantennal organ with compound vesicles, antennal Ⅲ sense organ with 2 sensory clubs, furca reduced to a small area of fine ganulation with 2+2 posterior setulae arranged in a row, seta d0 on a head and anal spines present. Onychiurus sp.1 is characterized by the peculiar distribution of dorsal (32/0,2-3,2-3/33333) and ventral (1/000/0101) pseudocelli that allow to distinguish it from the other congeneric species. Antennal segment Ⅲ with four guard setae, two sensory rods, two bent and granulated sensory clubs and five papillae irregular in shape. Postantennal organ consists of 10-12 finely granulated vesicles and tibiotarsi with distal whorl composed of nine setae.