| Thecla nugar Schaus, 1902 |
| Thecla oceia Godman & Salvin, 1887 |
| Thecla ocelligera J. Zikán & W. Zikán, 1968 |
| Thecla ochus Godman & Salvin, 1887 |
| Thecla ocrisia Hewitson, 1868 |
| Thecla ocrisia subsp. lita Hayward, 1949 |
| Thecla opacitas Druce, 1907 |
| Thecla ophia Hewitson, 1868 |
| Thecla opisena Druce, 1912 |
| Thecla oppia Godman & Salvin, 1887 |
| Thecla orasus Godman & Salvin, 1887 |
| Thecla orcynia Hewitson, 1868 |
| Thecla orgia Hewitson, 1867 |
| Thecla orios Godman & Salvin, 1887 |
| Thecla ornea Hewitson, 1868 |
| Thecla orses Godman & Salvin, 1887 |
| Thecla orsina Hewitson, 1877 |
| Thecla ortaloides Lathy, 1930 |
| Thecla ortalus Godman & Salvin, 1887 |
| Thecla oslari Dyar, 1904 |