Casiornis
Casiornis is a genus of South American birds in the tyrant flycatcher family Tyrannidae.
The genus contains the following two species:
| Image | Common Name | Scientific name | Distribution |
| Rufous casiornis | Casiornis rufus | Argentina, Bolivia, mid-central Brazil, Paraguay, and northeastern Uruguay | |
| Ash-throated casiornis | Casiornis fuscus | northeastern Brazil. |