3-Nitro-4-phenylpyridine is primarily used in organic synthesis as a versatile intermediate for the preparation of more complex chemical compounds. Its nitro group and aromatic structure make it suitable for various chemical reactions, including reduction, substitution, and cyclization processes. It is often employed in the development of pharmaceuticals, particularly in the synthesis of bioactive molecules and drug candidates. Additionally, it serves as a building block in the creation of agrochemicals and dyes, where its structural properties contribute to the desired chemical functionality. Researchers also utilize it in material science for designing advanced organic materials with specific electronic or optical properties.