The Moellenkampi beetle (Chalcosoma moellenkampi) is one of three large species of dynastid rhinoceros beetles from Southeast Asia belonging to the genus Chalcosoma. They are some of the largest and most impressive beetles in the world, although only one species actually bears this name (Chalcosoma moellenkampi). The Moellenkampi beetles belong to the beetle family Scarabaeidae along with other rhinoceros beetles. They are characterized by having two large, forward-projecting horns on the pronotum or thorax, and another large, forward and upward-projecting horn on the head. They also have a distinct metallic lustre, which is the reason behind their genus name, which derives from Greek, chalko-, and is the combining form of chalkós, meaning copper.