Boletus is a symbiotic ectomycorrhizal flesh fungi forming mycorrhizas with trees of Pinaceae, Fagaceae and Betulaceae. The species in the genus have relatively strong host specificity to enhance the growth of host plants and some of them are flavorful. But Korean rarely consumes these kinds of mushrooms and B. edulis has not been reported in this country. In the genus twenty six species have been reported in Korea, but the number is expected to increase as collection efforts are intensified. Keys to the families of Boletaceae and Strobilomycetaceae, to the genus of Boletaceae and to the species of Boletus were provided based on published keys and the descriptions of species reported in Korea. However, the key to the Boletus species did not include all the species occurring in Korea and not all the ones in the key are indigenous.