Aillyidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the informal group Sigmurethra.^[2]

Aillyidae is the only family in the superfamily Aillyoidea.^[2]

This family and the genus is named in honor of Swedish malacologist Adolf d'Ailly (1855-1927).^{[citation needed]}

The family Aillyidae is classified within the informal group Sigmurethra, itself belonging to the clade Stylommatophora within the clade Eupulmonata (according to taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).^[2] This family has no subfamilies.^[2]

Prestonellidae has been tentatively placed as a synonym of Aillyidae in the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.^[2] Herbert & Mitchell (2009)^[3] have moved Prestonellidae to the superfamily Orthalicoidea.^[3]

• Aillya Odhner, 1927^[4] - type genus of the family Aillyidae^[2]
  • Aillya camerunensis Odhner, 1927^[4][5] - it lives in Africa^{[3][4][where?]}