4,4′-Oxybis(benzoic acid) is primarily used as a monomer in the synthesis of high-performance polymers, particularly polyesters and polyamides. These polymers are valued for their thermal stability, mechanical strength, and chemical resistance, making them suitable for applications in the automotive, aerospace, and electronics industries. The compound is also employed in the production of liquid crystal polymers (LCPs), which are utilized in displays, connectors, and other electronic components due to their excellent electrical insulation properties and dimensional stability. Additionally, it serves as an intermediate in organic synthesis, contributing to the development of pharmaceuticals, dyes, and other specialty chemicals. Its ability to form stable, rigid structures makes it a key component in advanced material science applications.