Sinonasal malignant melanoma is a rarely seen aggressive tumor. Its diagnosis is usually delayed since they have no specific clinical signs or risk factors, present a different histological appearance and mimic many lesions. Its 5-year survival rate is low because of delayed diagnosis and high metastatic potential and reported to be 25% in the studies. In the present report, we have presented the 64-year-old female patient diagnosed with sinonasal malignant melanoma.