(2-Hydroxyphenyl)thiourea is primarily used in organic synthesis as a building block for the preparation of various heterocyclic compounds. It serves as a key intermediate in the development of pharmaceuticals, particularly in the synthesis of compounds with potential biological activities, such as antimicrobial, antifungal, and anticancer agents. Additionally, it is utilized in the production of dyes and pigments due to its ability to form stable complexes with metal ions, which can enhance color properties. In research, it is often employed as a reagent for studying reaction mechanisms and developing new synthetic methodologies. Its applications also extend to material science, where it is explored for creating advanced polymers and coatings with specific functional properties.