Diomus kosciuszko is a species of beetle of the family Coccinellidae. It is found in Australia (Australian Capital Territory, southern New South Wales).

Description Adults reach a length of about . The head and most of the pronotum (except for a darker area at the base) are brown. Sometimes, the body is entirely brown or the pronotum brown with a median darker area. The antennae and legs are yellowish or brown. The dorsal surface is covered by whitish pubescence forming whirly patterns.

Etymology The species name refers to its type locality, the Kosciuszko National Park.

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