| Aphycus mexicanus Masner, 1976 |
| Aphycus texanus Howard, 1898 |
| Apoanagyrus Compere, 1947 |
| Aprionomastix Girault, 1913 |
| Arrenoclavus Doutt, 1948 |
| Arrhenophagus Aurivillius, 1898 |
| Arrhenophagus chionaspidis Aurivillius, 1898 |
| Arrhenophagus diaspidiatus Agarwal, 1963 |
| Arrhenophagus diaspidis (Ashmead, 1900) |
| Arrhenophagus intermedius Blanchard, 1964 |
| Arrhenophagus parlatoreae (Risbec, 1951) |
| Asitus Erdös, 1955 |
| Asitus phragmitis (Ferrière, 1955) |
| Asteropaeus Howard, 1898 |
| Australzaomma Girault, 1925 |
| Avernes Noyes & Woolley, 1994 |
| Avernes gela Noyes & Woolley, 1994 |
| Aztecencyrtus Timberlake, 1926 |
| Aztecencyrtus flavus Timberlake, 1926 |
| Bekilyia Risbec, 1952 |