Glomangiopericytoma is a rare sinonasal tumor originating from modified perivascular glomus-like myoid cells, and accounts for less than 0.5% of all sinonasal tumors. It is a boderlline, low grade malignancy tumor and has good prognosis when completely resected. We report a case of a 43- year-old man who had been complaining of 3 episodes of right epistaxis for 5 days. In nasal endoscopy, polpoid lesion between right middle turbinate and nasal septum extended to choana area. Paranasal sinus computed tomography showed low density nodular lesion with subtle enhancing in the right nasal cavity posterior portion. We performed endoscopic sinus surgery under navigation system. 2.5cm sized polypoid lesion originated from right middle turbinate was observed and permanent biopsy was performed. Histopathoogic examination confirmed the resected specimen as glomangiopericytoma. The patient was followed up for 6 months without any recurrence or complications.