Scoparia plagiotis is a moth in the Crambidae family. It is found in Australia, where it has been recorded from Tasmania.
The wingspan is 19—20 mm. The forewings are light grey, ochreous-tinged and partially irrorated with white. The veins are marked with black. The first line is cloudy, white and posteriorly blackish-margined near the costa. The second line and the subterminal line are cloudy and white. The hindwings are whitish-grey, the hindmargin somewhat darker. Adults have been recorded on wing in December.