| Adejeania corpulenta (Wiedemann, 1830) |
| Adejeania rufipalpis (Macquart, 1843) |
| Adercomyia Arnaud, 1963 |
| Admontia Brauer & Bergenstamm, 1889 |
| Admontia ducalis Reinhard, 1958 |
| Admontia occidentalis Wulp, 1890 |
| Admontiini Townsend, 1931 |
| Adoryphorophaga Townsend, 1931 |
| Almugmyia Townsend, 1911 |
| Alophorella Townsend, 1912 |
| Alophorellopsis Townsend, 1927 |
| Ametadoria Townsend, 1927 |
| Ametadoria harrisinae (Coquillett, 1897) |
| Anazygosturmia Townsend, 1927 |
| Ancylogaster Bigot, 1884 |
| Androeuryops Beneway, 1961 |
| Angustia Sellers, 1943 |
| Angustia pallens Reinhard, 1945 |
| Anisia Wulp, 1890 |
| Anisia aberrans Wulp, 1890 |