o-Anisidine Hydrochloride is primarily used in the synthesis of azo dyes, which are widely applied in the textile industry for coloring fabrics. It serves as an intermediate in the production of various dyes and pigments, contributing to vibrant and long-lasting colors in textiles. Additionally, it is utilized in the manufacture of certain pharmaceuticals, where it acts as a building block for active pharmaceutical ingredients. In research and development, it is employed as a reagent in organic synthesis, aiding in the creation of complex chemical compounds. Its role in these industries underscores its importance in both industrial and scientific applications.