Field surveys for the genus Reticulitermes were conducted from 2013 to 2014 in Korea, and the results were compared with published data of the genus Reticulitermes. Totally, two species, R. speratus kyushuensis and R. kanmonensis were collected from several provinces, and R.kanmonensis is newly confirmed as an unrecorded species in Korea. The R. speratus kyushuensis was mainly collected in various trees, showing 0-2% genetic divergences; whereas, the R. kanmonensis was collected in pine woods of western regions, Gunsan, Wanju, Iksan (Jeollabuk-do), and Seocheon (Chungcheonnam-do). In the morphological comparison, R. kanmonensis is distinguished from R. speratus kyushuensis by more than 15 setae on pronotum and reveals 7.0% genetic difference (in a mitochondrial COII gene) from R. speratus kyushuensis in the molecular comparison.