Olfactory neuroblastoma is a rare tumor of the olfactory neuroepithelium. That is characterized by slow growth and local recurrence. We are presenting a case report of a 52 year old male patient with left side nasal mass which was diagnosed to have olfactory neuroblastoma. This patient was treated with total endoscopic excision of the mass. And radiotherapy was given. Combination of surgery and radiotherapy with or without chemotherapy is considered to be the standard treatment.