Osteochondroma of the carpal bones are rare. We recently treated a male patient in whom this lesion arose from the hamate bone. This study was conducted to recognize the clinical patterns of this rare disease entity and to evaluate the diagnosing modalities. A 39-year-old male patient who had bony protrusion of the wrist was treated by excisional biopsy. A plain x-ray film revealed a bony protrusion related to the distal carpal row, and a computed tomography of the wrist showed it to arise from the hamate bone. Pathologic finding confirmed the diagnosis of osteochondroma. There is no pain and no evidence of recurrence in last follow up at 12 months after excision.