The stenomask adapter device enables the hands-free use of an oral stenomask. In one embodiment, a stenography stenomask is inserted into the stenomask adapter device. The stenomask adapter device provides a stenomask adapter body and two arms. The arms pivotally attach to the stenomask adapter body via a fastener. A stenomask inserts into the mouth located at the front of the adapter body. A lip extending inwards secures the stenomask in the mouth. A seal is placed over an attachment head that secures the seal to the adapter body.