Runcinidae is a family of medium-sized sea slugs, marine opisthobranch gastropod mollusks.

They are headshield slugs, in the superfamily Runcinoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

[1] This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.