This issue of Otolaryngologic Clinics, guest edited by Dr. Ron Kuppersmith, is devoted to Nasal Obstruction. Articles in this issue include: Anatomy and Physiology of Nasal Obstruction; Diagnostic Algorithm for Nasal Obstruction; Treatment Paradigm for Nasal Airway Obstruction; Medical Treatment of Nasal Airway Obstruction; Pediatric Nasal Obstruction; Office-based Treatment of Nasal Obstruction; Septoplasty: Traditional vs. Endoscopic; Surgical Management of Turbinate Hypertrophy; Surgical Management of Nasal Valve Collapse; Surgical Management of Neurogenic/Vasomotor Rhinitis; Nasal Obstruction Considerations in Cosmetic Rhinoplasty; Nasal Obstruction Considerations in Sleep Apnea; and Measuring Nasal Obstruction Outcomes.