Scoparia ustimacula, also known as the black-marked brown Scoparia moth, is a species of moth in the family Crambidae. It was described by Cajetan Felder, Rudolf Felder and Alois Friedrich Rogenhofer in 1875. It is endemic to New Zealand and can be found in the North, South and Stewart Islands. This species inhabits dense native forest at altitudes from sea level to approximately 1000 m. Although little is known of the life history of this species, larvae have been observed feeding on Hydrocotyle species. Adults are on the wing year round but are more commonly observed from September to March. Adults are nocturnal, are attracted to light and have been collected by beating scrub.

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