Rhinoliths are uncommon mineralized nasal mass in children and adolescents. We reported a case of unilateral rhinolith that presented as a nasal polyp. A 29-year-old woman who had right-sided nasal purulent discharge, nasal obstruction, intermittent epistaxis, and posterior nasal drip for 6 months was admitted to our department. Nasal examination revealed a nasal mass between the inferior turbinate and the nasal septum, presenting as a nasal polyp or a nasal tumor. Paranasal sinus computed tomographic scan confirmed a calcified mass in soft tissue. We removed the rhinolith and the soft tissue that was around it with a transnasal endoscopic approach. Histologic analysis of the soft tissue identified inflammatory nasal polypoid tissue.