Benzylthiourea is primarily used as a corrosion inhibitor, particularly in acidic environments. It is effective in protecting metals such as steel and copper from corrosion by forming a protective layer on the surface. This makes it valuable in industrial applications where metal components are exposed to harsh chemicals or acidic conditions.

In addition to its corrosion-inhibiting properties, benzylthiourea is utilized in chemical synthesis as a reagent. It can act as a precursor or intermediate in the production of various organic compounds, including pharmaceuticals and agrochemicals. Its ability to form stable complexes with certain metal ions also makes it useful in analytical chemistry for metal ion detection and separation.

Furthermore, benzylthiourea has been explored in research for its potential biological activities, such as antimicrobial and antifungal properties. These characteristics make it a subject of interest in the development of new therapeutic agents or preservatives.