Polyphylla sikkimensis is a species of beetle of the family Scarabaeidae. It is found in Bhutan, China (Xizang), India (Himachal Pradesh, Sikkim, Uttarakhand) and Nepal.
Adults reach a length of about 28âÂÂ33 mm. They are similar to Polyphylla maculipennis and shares the deeply indented anterior margin of the clypeus, although it is slightly more broadened anteriorly. The pronotum is somewhat less narrowed anteriorly, and the lateral margins are straighter behind the middle. On the elytra, the scale patches are very small, and the scales within them are not as densely packed as in maculipennis.