Caesio cuning, the redbelly yellowtail fusilier, yellowtail fusilier, red-bellied fusilier or robust fusilier, is a species of marine ray-finned fish, a fusilier belonging to the family Caesionidae. It is native to the Indian and Western Pacific Oceans.

Taxonomy Caesio cuning was first formally described in 1791 as Sparus cuning by the German zoologist Marcus Elieser Bloch with the type locality given as Indonesia. This species has been placed in the subgenus Odontonectes. The specific name cuning is derived from the local Indonesian name ikan Tembra Cuning, ikan means "fish".

Description Caesio cuning has a deep and laterally compressed body. The jaws, vomer, and palatines have small conical teeth. The dorsal and anal fins have scales; the dorsal fin has 10 spines and 14 to 16, typically 15, soft rays while the anal fin contains 3 spines and 10 to 12, usually 11, soft rays. The pectoral fins have 17 to 20 fin rays, normally 18 or 19. This species attains a maximum total length of 60 cm (24 in).