Astaena macilenta is a species of beetle of the family Scarabaeidae. It is found in Costa Rica and possibly Honduras.
Adults reach a length of about 6.5âÂÂ10 mm. They are medium yellowish red, with the pronotum and elytra pruinose and opalescent. The head is moderately shiny.
The species name is probably derived from Latin macilenta (meaning thin) with reference to the narrow body of the species.