The Olive-backed Sunbird or Yellow-bellied Sunbird, Cinnyris jugularis (formerly Nectarinia jugularis), is an Asian sunbird.

The sunbirds are a group of very small Old World passerine birds which feed largely on nectar, although they will also take insects, especially when feeding young. Their flight is fast and direct on their short wings. Most species can take nectar by hovering like a hummingbird, but usually perch to feed most of the time.