Runcinoidea is a taxonomic superfamily (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005) or a clade Runcinaecea (according to the Malaquias et al. (2009)[1]) of sea slugs, marine gastropod mollusks in the order Runcinida[2][3] Runcinoidea was recognized as a superfamily in the clade Cephalaspidea, within the informal group Opisthobranchia in the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

[4] Malaquias et al. (2009)[1] reinstated Runcinacea as a valid taxon outside the Cephalaspidea.

They also recognized two families Runcinidae (with genus Runcina) and Ilbiidae,[1] but they did not mention superfamilies.

Jörger et al. 2010[2] moved Runcinacea to the Euopisthobranchia.

Runcinoidea was classified in the order Runcinida by the revised classification of the Gastropoda.