Plectris plaumanni is a species of beetle of the family Scarabaeidae. It is found in Brazil (Paraná).
Adults reach a length of about 7.5 mm. They are brown, with a glossy clypeus. The underside and antennae are light brown, the head covered with short, light setae. The pronotum is very densely covered with light setae, but leave a bare, triangular patch opposite the scutellum. The scutellum is densely covered with white setae, with a bare anterior margin. The elytra are densely covered with light setae.