| Mastigiomyia Reinhard, 1964 |
| Mastigiomyia delusa Reinhard, 1964 |
| Mauromyia Coquillett, 1897 |
| Mauromyia callitris (Reinhard, 1964) |
| Megaparia Wulp, 1891 |
| Megaparia venosa Wulp, 1891 |
| Megaprosopus Macquart, 1843 |
| Megaprosopus rufiventris Macquart, 1843 |
| Megistogaster Macquart, 1851 |
| Meigenielloides Townsend, 1919 |
| Meigenielloides cinerea Townsend, 1919 |
| Melaleuca Wulp, 1891 |
| Melanocyptera Townsend, 1927 |
| Meleterus Aldrich, 1926 |
| Meleterus montanus Aldrich, 1926 |
| Melisoneurini Townsend, 1936 |
| Metadexia Coquillett, 1899 |
| Metadoria Brauer & Bergenstamm, 1893 |
| Microchaetina Wulp, 1891 |
| Microchaetina cinerea Wulp, 1891 |