3-Phenoxybenzoic acid is primarily used as an intermediate in the synthesis of various chemicals, particularly in the production of pyrethroid insecticides. These insecticides are widely applied in agriculture to protect crops from pests and in public health to control disease-carrying insects like mosquitoes. Additionally, it serves as a building block in the development of pharmaceuticals, where it contributes to the creation of compounds with potential therapeutic effects. Its role in these industries highlights its importance in both pest management and medicinal chemistry.