Catriona aurantia is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Trinchesiidae.

[1] It was incorrectly synonymised with Catriona gymnota from the Western Atlantic but shown to be a distinct species by DNA analysis.

[3] This species has a translucent white body and slightly swollen cerata.

In larger specimens the rhinophores develop a pale orange suffusion.

Usually found in exposed places, in strong tidal streams, and in shallow water, from 0 m to 20 m depth.