Speech Therapy is the study of disorders that affect a person's communication, language, speech, cognition, voice and swallowing abilities. The disorders often occur with surgeries of the head and neck, cerebral vascular accidents (stroke), brain tumors, head injuries and neuromuscular diseases.

This sub-specialty has a long track record as being the leader in research in dysphagia, voice disorders, hearing implantation and rehabilitation. The first ever validated assessment kit on Cantonese-speaking hearing impaired children, the Cantonese Basic Speech Perception Test, was developed and published by the former Division of Otorhinolaryngology. The sub-specialty has also been taking a leading role in running training workshops in Hong Kong and mainland China for front-line professionals in managing clients of communication and swallowing difficulties.