This paper presents diagnostic criteria for M?nier?’s disease jointly formulated by the Classification Committee of the B?r?ny Society, The Japan Society for Equilibrium Research, the European Academy of Otology and Neurotology, the Equilibrium Committee of the American Academy of Otolaryngology-Head and Neck Surgery, and the Korean Balance Society. The classification includes two categories: definite M?ni?re's disease and probable Meni?re's disease. The diagnosis of definite M?ni?re's disease is based on clinical criteria and requires the observation of an episodic vertigo syndrome associated with low- to medium- frequency sensorineural hearing loss and fluctuating aural symptoms (hearing, tinnitus and/or fullness) in the affected ear. Duration of vertigo episodes is limited to a period between 20 minutes and 12 hours. Probable M?nier?'s disease is a broader concept defined by episodic vestibular symptoms (vertigo or dizziness) associated with fluctuating aural symptoms occurring in a period from 20 minutes to 24 hours.