Triphenyltin chloride is primarily used as a biocide in antifouling paints applied to ship hulls, effectively preventing the growth of marine organisms like algae and barnacles. It also serves as a fungicide in agriculture, protecting crops from fungal infections. Additionally, it is utilized in the preservation of wood and textiles, offering resistance against decay and pests. In industrial settings, it acts as a catalyst in certain chemical reactions, particularly in the production of polyurethane foams and plastics. Its role in stabilizing PVC products further enhances material durability. However, its use is regulated due to environmental and health concerns.