Abstract: The present invention is a two-way mailing envelope for an audio cassette for conveying written and oral messages between a first sender and a first recipient. The two-way mailing envelope for an audio cassette includes an envelope, a first label and a second label which is enclosed in the envelope. The envelope is formed by joining a front panel with a flap which is disposed adjacent to an open end and a rear panel. A letter and an audio cassette may be placed in the envelope. A first layer of protecting material and a second layer of protecting material are mechanically coupled to the front and rear panels, respectively, in order to protect the audio cassette from damage. The first label is mechanically coupled to the front panel. The address of the first recipient and the return address of the first sender are applied on the first label.