2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16825Luttinger's contributions abound in different parts of many-body physics. Here I review the ones that appear when one uses the Renormalization Group (RG) to study the subject: the Luttinger Liquid, Luttinger's Theorem (on the volume of the Fermi surface) and the Kohn-Luttinger Theorem on the superconducting instability of all metals as one approaches absolute zero.Latex 4 figures Sumbitted to the Luttinger Memorial Issue J. Stat. PhysMesoscale and Nanoscale Physicstext