This study aims to analyze the correlation between deviated nasal septum (DNS) and chronic rhinosinusitis. The objectives are to study the grades of DNS and clinical severity of chronic rhinosinusitis on diagnostic nasal endoscopy, and to evaluate the association between grades of DNS and clinical severity. The cross-sectional study was conducted at a tertiary care hospital in Maharashtra on patients with chronic rhinosinusitis and DNS presenting to the ENT OPD over 18 months. Patients were evaluated based on symptoms, diagnostic nasal endoscopy to assess DNS severity and correlate it with clinical severity of chronic rhinosinusitis symptoms.