Krommaster (meaning "Krom River star") is an extinct genus of early ophiuroids (brittle stars[1]) that lived nearly 410 million years ago in the early Devonian period of South Africa.

It was found in the upper unit of the Baviaanskloof formation, Cape super group, Table Mountain group, Eastern cape.

[2] Fossilized material of brittle stars were discovered in South African deposits older than the Bokkeveld Group for the first time by paleontologist Robert Gess, who collected several specimens originating from the upper unit of the Baviaanskloof Formation in Eastern Cape.

The new taxon was given the name Krommaster spinosus, the generic name combining "Kromm" (in reference to the Krom River, in the canyon of which the fossils were found) with the Latin word "aster" (meaning "star"), while the specific name is Latin for "spiny" (in reference to the animal's large spines).

[3] This genus is characterized by their moderately large encrinasterid with a disk covered in a mosaic of small, thin scales and extending form the fifth and sixth arm segments.