| Ischiogonus Wesmael, 1838 |
| Ischius Wesmael, 1837 |
| Isomecus Kriechbaumer, 1895 |
| Kahlia Ashmead, 1900 |
| Kareba Cameron, 1904 |
| Laccophrys Förster, 1862 |
| Leiophron Förster, 1862 |
| Leiophron pallipes (Curtis, 1833) |
| Leluthia Cameron, 1867 |
| Leluthia astigma (Ashmead, 1896) |
| Leluthia mexicana Girault, 1916 |
| Leptozele Cameron, 1910 |
| Lestricus Reinhard, 1865 |
| Leurinion Muesebeck, 1958 |
| Liganira Walker, 1860 |
| Liobracon Szépligeti, 1901 |
| Liobracon aquilonius Marsh, 1970 |
| Lipolexis Förster, 1862 |
| Lipolexis chenopodiasphidis Ashmead, 1889 |
| Lisitheria Cameron, 1904 |