This issue of Otolaryngologic Clinics of North America, devoted to Endoscopic Ear and Eustachian Tube Surgery, is guest edited by Drs. João Flávio Nogueira and Muaaz Tarabichi. Articles in this outstanding issue include: Anatomy of the Eustachian Tube; Physiology of the Eustachian Tube; Eustachian Tube Function and Testing; Radiology of the Eustachian Tube; Middle Ear and Eustachian Tube Dysfunction; Endoscopic Eustachian Tube Transnasal Surgery; Endoscopic Anatomy of the Protympanic Space; Outcomes Following Endoscopic Ear Surgery; Endoscopic Management of Superior Semicircular Canal Dehiscence; Endoscopic Management of Tumors in Middle Ear and Mastoid; Outcomes Following Endoscopic Stapes Surgery; Transtympanic Balloon Dilation of the Eustachian Tube; Selective Dysventilation Syndrome; Restoring Petrous Bone Ventilation; and Endoscopic Techniques in Tympanoplasty.