Ostorhinchus parvulus, also known as the redspot cardinalfish, is a marine fish in the family Apogonidae.
Redspot cardinalfish are semi-transparent with a large pink caudal spot. They reach a maximum size of .
The redspot cardinalfish can be found in groups around current-prone rocky reefs, up to a depth of .
Redspot cardinalfish are mouthbreeders that form distinct spawning pairs.