| Named By: | Louis Agassiz in 1846 |
| Time Period: | Early Devonian 415-398 Ma |
| Location: | Western Europe. North America |
| Size: | Approximately 20 to 30 centimetres long |
| Diet: | Carnivore/bottom feeder |
| Fossil(s): | Many specimens are known |
| Classification: | | Chordata | Osteostraci | Cephalaspidiformes | Cephalaspidae | |
Cephalaspis (meaning "head shield") is a probably monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in estuaries of the early Devonian.