Abstract: The golf posture and swing training harness of the present invention allows for convenience in set up, usage, and portability and may be worn by a user during golf training or playing. The harness comprises a body, two shoulder straps attached to the body, at least a waist strap either fixedly or removably attached to the body, and a shaft; wherein the shaft is removably inserted within a channel that extends the length of the body. When the user wears the harness, the shaft extends above and below the channel and the shaft contacts a back of the user's head, the user's scapular or upper back area, and the user's sacrum or lower back area, and these three points of contact of the shaft with the user's body enable the user to learn and achieve a proper golf posture and swing.