A 33G, 12-mm needle broke and entered the soft tissue in a 60-year old man. Panoramic X-ray imaging and cone-beam computed tomography (CT), which we performed a few hours after the breakage, revealed the needle in the soft tissue of the lower right mandibular molar. We immediately made an incision in the buccal gingiva of the lower right mandibular molar under local anesthesia and attempted to remove the needle but could not locate it. Thereafter, we adopted a watch-and-wait approach, as the patient had no subjective symptoms. Nine months later, we confirmed via CT that the needle had migrated subcutaneously to the right side of the neck. Two months later, we identified its location using C-arm fluoroscopy and removed it under general anesthesia. This report is a rare case and we are the first to document the subcutaneous migration of a fractured needle.