3-Bromoiodobenzene is primarily used as a versatile intermediate in organic synthesis, particularly in cross-coupling reactions such as Suzuki, Sonogashira, and Heck reactions. These reactions are essential for constructing complex aromatic compounds, which are widely applied in pharmaceuticals, agrochemicals, and materials science. Its dual halogen functionality allows for selective substitution, making it valuable in the development of fine chemicals and specialty polymers. Additionally, it serves as a building block in the synthesis of liquid crystals and organic electronic materials, contributing to advancements in display technologies and optoelectronics.