The Tonchongya tribal community is a small community and can be found in isolated pockets of Bandarban, Khagrachaaria, Rangamati, and Cox’s Bazar districts of Bangladesh in the Chittagong Hill Tracts region. Since not much is known about this community, particularly regarding their tribal medicinal practices, the objective of this study was to document the medicinal practices of a Tonchongya healer practicing in Cox’s Bazar town of Cox’s Bazar district. The healer used medicinal plants for cure of diseases. A total of sixteen plants distributed into thirteen families were used by the healer. The various ailments that he treated included respiratory tract disorders, diabetes, edema, debility, cuts and wounds, infections, vomiting tendency, tumor, gastrointestinal disorders, piles, sexually transmitted diseases, pain, leucorrhea, fever, obesity, skin cancer, skin diseases, and intestinal and liver disorders. Since plants have always formed a rich source of efficacious drugs, the plants of the Tonchongya healer, particularly the plants used to treat diabetes, sexually transmitted diseases, tumors, and skin cancer merit further scientific research as to their disease curing potential leading to discovery of perhaps novel drugs.