3-Ethoxy-4-nitrobenzoic acid is primarily used in organic synthesis as an intermediate for the production of more complex chemical compounds. It serves as a building block in the development of pharmaceuticals, particularly in the synthesis of active pharmaceutical ingredients (APIs) that require nitro and ethoxy functional groups. Additionally, it is utilized in the preparation of dyes and pigments, where its nitro group contributes to the color properties of the final product. In research, it is employed in the study of chemical reactions involving aromatic compounds, aiding in the understanding of reaction mechanisms and the development of new synthetic pathways. Its unique structure also makes it a candidate for use in the development of agrochemicals, such as herbicides and pesticides, where specific functional groups are essential for biological activity.