Maladera masumotoi is a species of beetle of the family Scarabaeidae. It is found in China (Jiangxi) and Taiwan.
Adults reach a length of about 9.6 mm. They have a dark reddish brown, oblong-oval body. The antennae are yellowish. The surface is dull (but the labroclypeus is shiny) and glabrous, except for a few short setae on the sides of the elytra.