Green Public Procurement (GPP) is an approach adopted by Public Administrations (PAs) that integrates environmental criteria and technologies throughout the entire lifecycle of the purchasing process. While GPP is voluntary in Europe, it is mandatory in Italy under Article 34 of Law Decree 50/2016 (Public Contract Code). In 2008, the Italian government further incorporated the Action Plan for the environmental sustainability of public administration consumption, which sets national objectives, defines categories of goods and services, establishes Minimum Environmental Criteria (MEC), and provides guidelines for PAs to promote the adoption of GPP. Additionally, the Italian Public Contract Code mandates compliance with public procurement procedures only when contracts are strictly related to the core business of the PA. This review aims to analyze the challenges that currently hinder the implementation of GPP, particularly in Italy, with a focus on specific sectors within the PA. The authors conducted an analysis of the evolution of GPP and identified possible solutions to support its integration into public administration. The findings highlight that a significant barrier exists for public administrations involved in special sectors such as gas, thermal energy, electricity, water, transport, postal services, and land exploitation.