Chalcosoma is a genus of Southeast Asian rhinoceros beetles. They are known as three horned rhinoceros beetles for their trident like horn. They are endemic to Southeast Asia.

Biolib lists four species:^[1]

• Chalcosoma atlas
• Chalcosoma chiron (incl. synonyms Chalcosoma caucasus and Chalcosoma janssensi)
• Chalcosoma moellenkampi
• Chalcosoma engganensis

• List of largest insects

• Data related to Chalcosoma at Wikispecies
• Media related to Chalcosoma at Wikimedia Commons