Ferrocenylmethyltrimethylammonium (iodide) is an organometallic salt comprising a ferrocene group connected to a quaternary ammonium cation via a methylene bridge. This compound has been employed as a catalyst and reagent in various organic reactions, including oxidation, reduction, and C–H bond activation. Additionally, it serves as a precursor for synthesizing other organometallic compounds and is considered a potential material for electrochemical applications.