| Ophionellus virginiensis Muesebeck, 1979 |
| Ophioneura Cameron, 1904 |
| Ophioninae Shuckard, 1840 |
| Ophionocryptus Schmiedeknecht, 1908 |
| Ophionopterus Morley, 1912 |
| Ophiopterus Brullé, 1846 |
| Ophiopterus cincticornis Cresson, 1865 |
| Ophiopterus ferrugineus Cresson, 1873 |
| Ophiopterus flavidus Dasch, 1984 |
| Ophthalmochorus Roman, 1925 |
| Opisorhyssa Kriechbaumer, 1890 |
| Opisoxestus Ashmead, 1900 |
| Opodactyla Seyrig, 1932 |
| Ortezia Cresson, 1874 |
| Ortezia aciculata (Cresson, 1868) |
| Ortezia egregia (Cresson, 1868) |
| Ortezia selaginellae Morrison, 1952 |
| Orthocentrellus Benoit, 1954 |
| Orthocentrinae Förster, 1869 |
| Orthocentrus Gravenhorst, 1829 |