3-Cyano-5-hydroxybenzoic acid is primarily utilized in the synthesis of organic compounds, particularly in the development of pharmaceuticals and agrochemicals. Its unique structure makes it a valuable intermediate in creating molecules with potential biological activity. It is often employed in the production of dyes and pigments due to its ability to form stable, colored complexes. Additionally, this compound plays a role in research and development for designing new materials with specific optical or electronic properties. Its applications extend to the field of analytical chemistry, where it is used as a reagent or standard in various chemical analyses.