Temognatha variabilis, commonly known as the variable jewel beetle, is a beetle of the family Buprestidae.
Temognatha variabilis can reach a length of about . The body colour is highly variable, ranging from yellowish to dark red. Helytra are punctato-striate and may have black markings. The thorax usually show a median black area with yellow or bright red markings on each side. Head and legs are black with greenish reflections.
Larvae live in She-oak tree of Casuarina species (Casuarinaceae).
This species can be found in southeastern Australia.