In this book, we reported that amphiphilic dendrimer is stabilizing agent for the formation of trimetallic nanoparticles viz., Ag/Pd/AuNPs and Fe/Pt/RuNPs. The catalytic potential of these catalysts were examined by conducting the reduction of p-nitrotoluene & malachite green reactions and oxidation of 3, 3, 5, 5 - tetramethyl benzidine & Ascorbic acid. From the observed results, it reveals that the newly developed amphiphilic dendrimer stabilized/encapsulated homogeneous trimetallic nanoparticles can be an efficient catalyst to reduce the environmentally important organic pollutants....