Maechidius aiyura is a species of beetle of the family Scarabaeidae. It is found in Papua New Guinea. It occurs in lower montane rainforests.
Adults reach a length of about 9.15 mm. The dorsum is uniformly black-brown, while the venter, legs and labroclypeus are castaneous brown. The head is transverse, glossy dorsally and ventrally and flattened dorsally.
The species name is derived from the Aiyura Valley, the type locality.