Younginidae is an extinct family of diapsid reptiles from the Late Permian and Early Triassic.

Younginidae was traditionally assigned to Eosuchia, an order containing an assemblage of basal diapsids now thought to represent an evolutionary grade rather than a true clade.

Romer considered Younginidae to include many genera that are no longer classified as younginids: Paliguana, Palaegama, and Saurosternon are now considered basal lepidosauromorphs, Galesphyrus and Heleosuchus are diapsids of uncertain affinities (incertae sedis), Heleophilus is now a millerettid, and Heleosaurus is now thought to be a varanopid synapsid.

[1][2] Like Eosuchia, Younginiformes is no longer considered valid; for example, the phylogenetic analysis of Reisz et al. place younginids close to Sauria, the clade including the still-living archosauromorph and lepidosauromorph reptiles, while the younginiform family Tangasauridae takes a more basal position in Neodiapsida.

[3] Below is a cladogram from that analysis:[3] Captorhinidae Araeoscelidia Orovenator Lanthanolania Tangasaurus Acerosodontosaurus Hovasaurus Thadeosaurus Youngina Claudiosaurus Archosauromorpha Lepidosauromorpha