Thorunna furtiva is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae. It is the type species of the genus Thorunna.
Thorunna furtiva has a white mantle with a thin orange-yellow line at the edge.
This species was described from Camiguin, Luzon, the Philippines. It has been reported throughout the western tropical Indo-Pacific Ocean.
