Fionoidea is a superfamily of is a superfamily of nudibranchs, shell-less marine gastropod molluscs or sea slugs, in the suborder Aeolidacea. The families within Fionoidea were shown to be monophyletic on DNA evidence and a re-interpretation of family characteristics was provided.
According to Korshunova and colleagues (2025), the following genera are recognised in the superfamily Fionoidea: