Abstract: A microphone mask to be worn in front of the mouth of an underwater diver has a microphone assembly and a teethpiece assembly mounted in a rubber waterproof enclosure. The enclosure has an air passage extending from an inlet opening to a rear outlet opening. The teethpiece assembly includes a plastic insert with a vertical plate mounted in the enclosure. The vertical plate has openings for the air passage as well as to allow sound to travel from the diver's mouth to the microphone assembly. A teeth member extends rearwardly out of the outlet opening into the diver's mouth where it is held between the diver's teeth. The teeth member is connected to the insert by resilient spring members which draw the enclosure rearwardly against the diver's face. There is a sealing surface around the outlet opening, and this seals it around the outside of the diver's mouth. This eliminates the need for a headband and facilitates the use of the microphone mask for the combination of breathing and speaking.