Elachista commoncommelinae is a moth of the Elachistidae family. It is found along the coast of tropical Queensland. The wingspan is 6–6.4 millimetres (0.24–0.25 in) for males and 6.2–6.8 millimetres (0.24–0.27 in) for females. The forewings are black with a bronzy sheen. The hindwings are dark grey. The larvae feed on Commelina species. They mine the leaves of their host plant.