N-Benzyl-N,N-diethylethanaminium iodide is a quaternary ammonium salt consisting of a positively charged N-benzyl-N,N-diethylethylamine cation and a negatively charged iodide anion. This compound is commonly employed as a phase-transfer catalyst in organic chemical reactions, facilitating the transport of reactants between immiscible phases. Additionally, it serves as a reagent for synthesizing various organic compounds and is utilized in industrial and personal care products as a surfactant or emulsifier.