Favites spinosa is a species of stony coral in the family Merulinidae.

[1] Favites spinosa forms small, solid rounded colonies.

The corallites (stony cups in which the polyps are seated) are deep with steep walls.

The septa (stony ridges between the corallite walls) are straight and widely separated, alternately long and short, and rough due to the distinctive serrated teeth.

This is because it is a generally uncommon species with a scattered distribution throughout its wide range; its depth limit is 10 m (30 ft) and this makes it particularly vulnerable to habitat disturbance, bleaching and coral disease.