Cynaeda gigantea is a species of moth in the Crambidae family. It is found in France, Switzerland, Croatia, Bosnia and Herzegovina, Hungary, Romania, the Republic of Macedonia, Greece and Turkey. The larvae feed Anchusa and Onosma species. They mine the leaves of their host plant. The mine has the form of a large, inflated blotch. The frass is deposited in a central mass. Pupation takes place within the mine in a cocoon in the frass clump.