This work deals with four species of oribatid mites of the family Brachychthoniidae Thor, 1934 from Korea. A new species, Sellnickochthonius gotjawaliensis sp. nov. is proposed, and three known species, Liochthonius leptaleus Moritz, 1976, Liochthonius muscorum Forsslund, 1964, and Sellnickochthonius cricoides (Weis-Fogh, 1948) are newly reported to the fauna of Korea. Diagnostic characterization and illustration of each species along with their habitat ecology and distributional data are given. A diagnostic key to adults of all species of Brachychthoniidae known from Korea is presented.