Osteochondroma, which is an osteocartilaginous exostosis, is essentially the most common primary bone tumor. These benign neoplasms are generally asymptomatic and have a relatively small potential for adverse effects. Calcaneal osteochondroma is rare, furthermore osteochondroma accompanying with gouty arthritis is very rare. Also, the subtalar joint is not a classic site of acute gout. In this report, we report the case of a patient who experienced an unusual calcaneal osteochondroma with undiagnosed gouty arthritis of the subtalar joint.