Obstructive sleep apnea syndrome (OSAS) is caused by repetitive upper-airway narrowing or collapse during sleep resulting in hypopneas and apneas. When a patient is diagnosed of OSAS with polysomnogram, he/she should receive upper airway evaluation to find the narrow site. The anatomic narrow site can be nasal cavity, nasopharynx, oropharynx, and/or hypopharynx. Surgical treatment for OSAS should be tailored to the anatomic narrow site. In this article, the authors describe surgical treatment options for OSAS.