Trigonochlamydidae is a family of slugs, gastropods in the clade Eupulmonata (according taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
Trigonochlamydidae was in superfamily Trigonochlamydoidea Hesse, 1882, in subinfraorder Sigmurethra before. There was only one family within this superfamily and that is the Trigonochlamydidae.
The Trigonochlamydidae family is classified within the "Limacoid clade", itself belonging to the clade Stylommatophora within the clade Eupulmonata (according taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).