Hancockiidae is a family of sea slugs, nudibranchs, marine gastropod mollusks in the superfamily Tritonioidea.
This family is within the clade Cladobranchia (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
The family Hancockiidae has no subfamilies and only one genus. It is closely allied to the family Dotidae.
The family Hancockiidae has only one valid genus: