Tonsillitis and pharyngitis are among the most common infections in the head and neck. Viral tonsillitis is usually caused by enterovirus, influenza, parainfluenza, adenovirus, rhinovirus and Epstein-Barr virus (causing infectious mononucleosis). Acute bacterial tonsillitis is most commonly caused by group A beta-hemolytic streptococci. On the other hand, pseudomembranous and necrotizing tonsillitis are usually caused by fusiform bacilli and spirochetes. Here we report what is, to our knowledge, the first case of necrotizing tonsillitis caused by group C beta-hemolytic streptococci.