Liomenochilus is a genus of beetle of the family Scarabaeidae. It is monotypic, being represented by the single species, Liomenochilus ongi, which is found in Australia (Western Australia).

Description Adults reach a length of about . The head, clypeus and frons are brownish-yellow and the antennae are brown. The pronotum is yellow with a black spot. The scutellum is black and the elytra are yellowish-brown with black margins.

Etymology The species is named in honour of its collector, S. Ong.

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