Pachyserica nantouensis is a species of beetle of the family Scarabaeidae. It is found in Taiwan.
Adults reach a length of about 8.2âÂÂ9 mm. They have a dark green to brown, elongate-oval body. The legs, pronotal and elytral margins are reddish-brown and the antennae are yellowish-brown. The surface is almost entirely dull. The upper surface has numerous white scale-like hairs and the elytra are without erect setae.