O-(4-Methoxybenzyl)hydroxylamine is primarily used as a versatile reagent in organic synthesis. It serves as a key intermediate in the preparation of various biologically active compounds, particularly in the development of pharmaceuticals. Its functional group allows it to participate in reactions such as the formation of oximes, which are useful in creating complex molecular structures. Additionally, it is employed in the synthesis of heterocyclic compounds, which are important in medicinal chemistry for designing drugs with specific therapeutic properties. Its application extends to the field of material science, where it is used in the modification of polymers and surfaces to impart specific chemical functionalities.