| Nyctelius nyctelius subsp. nyctelius (Latreille, 1824) |
| Oarisma Scudder, 1872 |
| Oarisma edwardsii (Barnes, 1897) |
| Oarisma era Dyar, 1927 |
| Oarisma garita (Reakirt, 1866) |
| Oarisma garita subsp. calega (Godman, 1900) |
| Ochlodes Scudder, 1872 |
| Ochlodes agricola (Boisduval, 1852) |
| Ochlodes agricola subsp. agricola (Boisduval, 1852) |
| Ochlodes samenta Dyar, 1914 |
| Ochlodes sylvanoides (Boisduval, 1852) |
| Ochlodes sylvanoides subsp. sylvanoides (Boisduval, 1852) |
| Ocyba Lindsey, 1925 |
| Ocyba calathana (Hewitson, 1868) |
| Ocyba calathana subsp. calanus (Godman & Salvin, 1894) |
| Oeonus Godman, 1900 |
| Oeonus pyste Godman, 1900 |
| Onenses Godman & Salvin, 1895 |
| Onenses hyalophora (R. Felder, 1869) |
| Onespa Steinhauser, 1974 |