Ticks were collected from bats captured in caves, abandoned mines, and under bridges in the Republic of Korea as part of the 65^th Medical Brigade vector-borne disease surveillance program in collaboration with the National Institute of Biological Resources. A total of seven ticks (1 nymph and 3 larvae of Ixodes simplex, and 3 females of Ixodes vespertilionis) were removed from 7/141 bats (5.0%). Ixodes simplex was collected from both Rhinolophus ferrumequinum (Chiroptera: Rhinolophidae) and Miniopterus schreibersii (Chiroptera: Vespertilionidae), while I. vespertilionis was collected only from R. ferrumequinum. This is the first report of I. simplex from the Republic of Korea.