A checklist of the ceratopogonid specimens housed in the Natural History Museum of the National Science Museum, Thailand (THNHM) is presented for research and scientific communication. A total of 504 specimens, in 94 species of Ceratopogonidae, including 63 partypes of 19 species in nine genera are housed in THNHM. With 52 species (23 type and 194 non-type specimens), Culicoides Latreille, 1809 has the largest representation. The specimens were collected mainly in Thailand and neighbor-ing countries from 1959 to 1979.