Maechidius aenescens is a species of beetle of the family Scarabaeidae. It is found in Papua New Guinea.
Adults reach a length of about 6-7.40 mm. The dorsum and venter are brown, the forebody with a slight green lustre. The head is flattened dorsally, somewhat depressed on either side at the anterior angle of the labroclypeus. They are slightly glossy dorsally and ventrally.