| Family | Baeonotidae Byers, 1969 ⇒ Cecidomyiidae
| 0 0 | Genera Species |
| Family | Bolitophilidae Malloch, 1917
| 6 18 | Genera Species |
| Family | Cecidomyiidae Newman, 1834 Cecidomyidae, Gall And Forest Midges, Gall gnats | 1363 11532 | Genera Species |
| Family | Crosaphididae ♰ Kovalev, 1983
| 1 2 | Genus Species |
| Family | Diadocidiidae Winnertz, 1863
| 9 10 | Genera Species |
| Family | Ditomyiidae Keilin, 1919
| 13 100 | Genera Species |
| Family | Fungivoridae Speiser, 1909 ⇒ Mycetophilidae
| 0 0 | Genera Species |
| Family | Huaxiasciaritidae ♰ Hong, 2002 ⇒ Mycetophilidae
| 22 30 | Genera Species |
| Family | Keroplatidae Rondani, 1856 Fungus gnats, Keroplatid Fungus Gnats | 135 1752 | Genera Species |
| Family | Lygistorrhinidae Hendel, 1936 Long beaked fungus gnat | 16 29 | Genera Species |
| Family | Macroceridae Malloch, 1917 ⇒ Keroplatidae
| 0 0 | Genera Species |
| Family | Mycetophilidae Newman, 1834 Fungus Gnat, Fungus gnats | 460 11996 | Genera Species |
| Family | Parapleciidae ♰ Hong, 1983 ⇒ Paraxymyiidae
| 0 0 | Genera Species |
| Family | Paraxymyiidae ♰ Rohdendorf, 1946 Paxylommatid wasps | 8 14 | Genera Species |
| Family | Rangomaramidae Jaschhof & Didham, 2002
| 14 58 | Genera Species |
| Family | Sciaridae Billberg, 1820 Black fungus gnats, Dark winged fungus gnats, Root gnats | 146 682 | Genera Species |
| Genus | Afrotricha Chandler, 2002
| 1 | Species |
| Genus | Theriotricha
| 0 | Species |