1. A specialty including otology, rhinology, laryngology, and surgery of the head and neck.
2. The branch of medicine that deals with the diagnosis and treatment of diseases of the ear, nose, and throat.

A medical and surgical specialty concerned with the diagnosis, management, and treatment of diseases and disorders of the ear, nose, throat (ENT) and related structures of the head and neck, including the sinuses, larynx (voice box), oral cavity, and upper pharynx (mouth and throat).

Subspecialty areas within otolaryngology include pediatric otolaryngology (children), otology/neurotology (ears, balance, and tinnitus), allergy, facial plastic and reconstructive surgery, head and neck, laryngology (throat), and rhinology (nose).

Otolaryngology is commonly called ENT by medical specialists in these fields. It is said to be the oldest medical specialty in the United States.