Cubital tunnel syndrome is a compressive neuropathy caused by ulnar nerve compression on elbow joint. The causes of cubital tunnel syndrome are unknown but it can be caused by trauma, bone deformity and space occupying lesions like a mass. Osteochondroma is a common benign bone tumor, it usually develops at the metaphysis of the long bones. Symptoms of nerve compression by osteochondroma are very rare and there have been few reports of cubital tunnel syndrome caused by osteochondroma. The authors experienced a 46-year-old male patient who have cubital tunnel syndrome by osteochondroma. Therefore, we report the case with literature review.