Maladera ostentatrix is a species of beetle of the family Scarabaeidae. It is found in Indonesia (Java).
Adults reach a length of about 12 mm. They are broadly ovate, dull but not densely tomentose, and weakly opalescent. They are reddish-brown underneath, with the tibiae and tarsi shiny, and dark above with a slight metallic silky tinge, which is olive-greenish on the elytra.