Thyroglossal duct cysts are located in the midline of the neck. The coexistence of carcinomas in thyroglossal duct cysts is extremely rare < 1 %, with most common being papillary carcinomas. Usually, the diagnosis is made postoperatively after excision of the cyst with histopathological examination. We are reporting a case of 26–year–old female diagnosed with papillary carcinoma within a thyroglossal duct cyst, who underwent total thyroidectomy.