Diomus bimaculatus is a species of beetle of the family Coccinellidae. It is found in Australia (Queensland).

Description Adults reach a length of about . The head and pronotum are yellow, although the pronotum is sometimes orange with a darker median area. The elytra are dark brown to black with yellowish spots. The dorsal surface is covered by white or silvery pubescence.

Etymology The species name refers to the bi-maculate elytra.

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