4-Hydroxybenzhydrazide is used as an intermediate in the synthesis of pharmaceuticals, particularly in the production of drugs targeting tuberculosis and other bacterial infections. It plays a role in the development of hydrazide-based compounds, which are known for their antimicrobial and antifungal properties. Additionally, it is utilized in organic chemistry research for the preparation of Schiff bases, which have applications in material science and as corrosion inhibitors. Its derivatives are also explored for potential use in cancer therapy due to their ability to inhibit specific enzymes involved in tumor growth. Furthermore, it is widely employed in analytical chemistry, especially in spectroscopic methods to detect and quantify heavy metals such as copper and iron, owing to its capacity to form stable complexes with these metal ions. It also serves as a starting material for synthesizing other compounds in the pharmaceutical industry and contributes to the production of polymers and resins with specialized properties.