The family Cliidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod molluscs.
This family name has for a long time been known as Clioidae, or the subfamily Clioinae <small>Jeffreys, 1869</small> belonging to the family Cavoliniidae, each time with the type genus Clio <small>Linnaeus, 1767</small>. Unfortunately this is often confused with another molluscan family Clionidae, which has the type genus Clione. The International Commission on Zoological Nomenclature (ICZN) has therefore changed the name back to its original spelling Cliidae <small>Jeffreys, 1869</small>, type genus Clio Linnaeus, 1767