Maechidius legalovi is a species of beetle of the family Scarabaeidae. It is found in Indonesia (Sulawesi), where it occurs in lowland rainforests.
Adults reach a length of about 7.40 mm. The dorsum and venter are uniformly black, while the labroclypeus, anterior and lateral margins of the pronotum, mouthparts and legs are dark castaneous.
The species is named after the expert of Curculionoidea Andrei A. Legalov.