N-Iodophthalimide is widely used as a source of electrophilic iodine in organic synthesis. It serves as an efficient iodinating agent for aromatic compounds, alkenes, and heteroatoms under mild conditions. It is particularly useful in the preparation of iodoarenes, which are important intermediates in cross-coupling reactions such as Suzuki and Heck reactions.

It is also employed in oxidative cyclization reactions to construct heterocyclic compounds, including lactones, lactams, and nitrogen-containing rings. Due to its stability and selectivity, N-iodophthalimide is favored in the synthesis of natural products and pharmaceuticals where controlled iodination is required.

Additionally, it acts as a reagent in radical reactions when combined with reducing agents or under photochemical conditions, enabling C–H functionalization and carbon–carbon bond formation. Its role in iodine-transfer reactions makes it valuable in both academic research and industrial applications involving iodine chemistry.