Isospiridae is an extinct family of fossil sea snails, Paleozoic gastropod mollusks.
[2] This family is unassigned to superfamily.
This family has no subfamilies according to the taxonomy by Bouchet & Rocroi (2005).
It is classified as "Basal taxa that are certainly Gastropoda" by Bouchet & Rocroi (2005).
[2] Peter J. Wagner consider Isospiridae as synonym of Cyrtonellidae within Tergomya,[4][5] The Paleobiology Database has become adatapted to[5] this unpublished opinion by Wagner.