4-Octylbenzoic acid is primarily used in the synthesis of liquid crystal materials, which are essential components in display technologies such as LCD screens. Its structure allows it to contribute to the stability and alignment of liquid crystals, enhancing the performance of electronic displays. Additionally, it serves as an intermediate in organic synthesis, particularly in the production of specialty chemicals and polymers. Its hydrophobic properties make it suitable for applications in coatings and surfactants, where it can improve water resistance and surface activity. In research, it is utilized to study phase behavior and molecular interactions in complex systems.