In this paper, we described roles of speech therapists (STs) in the treatment of voice disorders and collaboration between otolaryngologists and STs in our hospital. The main role of STs in the treatment of voice disorders is voice therapy. Voice therapy is indicated when patients have issues producing a voice with or without organic diseases. When starting voice therapy, it is of vital importance to select the optimal method from among various techniques and demonstrate its efficacy on the spot as much as possible. We herein report the results of collaboration between otolaryngologists and STs at our hospital. Otolaryngologists and STs interview patients and evaluate their voices together. An ST is also present at the time of thyroplasty under local anesthesia, and they evaluate the patient’s voice in order to ensure optimal adjustments are made. In addition, we hold weekly conferences and study sessions. We believe that mutual understanding and close collaboration between otolaryngologists and STs is mandatory when treating voice disorders.