Background:Tonsillitis is inflammation of tonsils, a common clinical condition caused by either bacteria or viral infection. The present study was conducted to assess complications of tonsilitis in a tertiary care hospital in Haryana. Materials & Methods:87 patients of tonsilitis of both genders were enrolled.A thorough examination was carried out. Clinical features and complication of tonsilitis was recorded Results: Out of 87 patients, males were 40 and females were 47. The most common clinical features were sore throat in 75, fever in 24, dysphagia in 65, cough in 32 and lymphadenitis in 19. The difference was significant (P< 0.05). Complicationswere peritonsillar abscess in 15, rheumatic fever in 4 and acute glomerulonephritis in 2 patients. The difference was significant (P< 0.05). Conclusion: Most commoncomplicationsof tonsilitis were peritonsillar abscess, rheumatic fever and acute glomerulonephritis.