Objectives 1) To investigate the role of Helicobacter pylori in etiopathogenesis of nasal polyposis. 2) To compare the severity of nasal polyposis disease with presence of Helicobacter pylori. Methods This study was performed on 35 patients (29 male, 6 female; aged between 17 and 77) who applied to GATA Haydarpasa Training Hospital Otolaryngology Clinic in 2006 and 2007. They all complained of nasal obstruction and were diagnosed as nasal polyposis after examination. Samples taken from all patients during endoscopic sinus surgery were subjected to cetyl metil amonium bromur (STAB) method to purify DNA of Helicobacter pylori(H. pylori). All patients were evaluated for reflux disease. Severity of nasal polyposis disease was compared with presence of H. pylori by performing endoscopic nasal examination and computerized tomography. Results H. Pylori was found negative for 24 patients (%68,6) and positive for 11 patients (%31,4). There was no statistically significant difference between presence of H. pylori and that of reflux disease in nasal polyposis (p>0.05). Difference between presence of H. pylori and results of endoscopic nasal examination and computerized tomography was not statistically significant (p>0.05). Conclusions We found that presence of H. pylori and reflux disease are not associated with etiopathogenesis of nasal polyposis.