Adela thorpella is a moth of the Adelidae family or fairy longhorn moths. It was described by Powell in 1969. It is found in California. The length of the forewings is 5.7–7 millimetres (0.22–0.28 in). The forewings are olivaceous-bronze, reflecting metallic brass, at times overlaid with pale yellowish scales and either without markings or (more usually) at least a trace of a white spot pattern. The hindwings are brown, faintly reflecting purplish.