Protoreaster is a genus of sea stars in the family Oreasteridae from the Indo-Pacific. They are sometimes seen in the marine aquarium trade.
The following species are in the genus:
| Image | Scientific name | Common name | Distribution |
|---|---|---|---|
| Protoreaster linckii (Blainville, 1830) | Red-knobbed starfish | Indian Ocean | |
| Protoreaster nodosus (Linnaeus, 1758) | Chocolate chip sea star | Indian Ocean and western Pacific ocean | |
| Protoreaster nodulosus (Perrier, 1875) | Knobbly seastar | North Western Australia | |