Maechidius miklouhomaclayi is a species of beetle of the family Scarabaeidae. It is found in Papua New Guinea.
Adults reach a length of about 6.60 mm. The dorsum and venter are uniformly black-brown, and the labroclypeus is castaneous brown.
The species is named in honour of Nicholas Miklouho-Maclay, a famous Russian explorer, ethnologist, anthropologist and biologist.