An open fitted hearing aid adapter allows a user to quickly transition between an open fitted style hearing aid and a closed fitted style hearing aid. This allows the user to conveniently benefit from the different advantages offered by both styles of hearing aids, according to the users current needs. The open fitted hearing aid adapter has a custom ear mold, at least one receiving surface channel 19, and a tube securing mechanism. The receiving surface channel 19 is the component in which the open hearing aid component(s) (e.g., tubing, wiring, speaker, and/or microphone) of an open fitted hearing aid is positioned. The open hearing aid component(s) is positioned within the receiving surface channel 19 through a tubing slit, rather than being threaded through the custom ear mold and generally affixed in a permanent manner. The tube securing mechanism acts to hold the open hearing aid component(s) in place.