Maechidius acutus is a species of beetle of the family Scarabaeidae. It is found in Indonesia (Moluccas).
Adults reach a length of about 6.1-6.9 mm. They have a dark brown, dull body, with ferruginous legs.
The species name is derived from Latin acutus (meaning pointed or acute) and refers to the distinct posterolateral angles at the pronotal base.