N-Methyl-o-toluidine is primarily used in the synthesis of dyes and pigments, particularly in the production of azo dyes, which are widely employed in the textile industry for coloring fabrics. It serves as an intermediate in the manufacture of various organic compounds, including pharmaceuticals and agrochemicals. Additionally, it finds application in chemical research as a reagent for developing new compounds and studying reaction mechanisms. Its role in organic synthesis is significant due to its ability to introduce specific functional groups into target molecules, making it valuable in industrial and laboratory settings.