4-Chlorophenylthiourea is primarily used in research and development as a chemical intermediate. It serves as a building block in the synthesis of various organic compounds, particularly in the production of pharmaceuticals and agrochemicals. Its thiourea moiety makes it valuable in creating compounds with potential biological activity, such as antimicrobial or antifungal agents. Additionally, it is utilized in studies related to corrosion inhibition, where it helps in developing protective coatings for metals. In analytical chemistry, it can be employed as a reagent for detecting specific metal ions due to its chelating properties.