3,5-Dichloro-4-formylbenzoic acid is primarily used as an intermediate in organic synthesis. It plays a significant role in the production of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs). Its reactive aldehyde and carboxylic acid groups make it a versatile building block for constructing complex molecules. Additionally, it is utilized in the synthesis of agrochemicals, including herbicides and pesticides, due to its ability to introduce specific functional groups into target compounds. The compound is also employed in research and development for creating novel chemical entities with potential biological activities.