This document provides an overview of negotiating and implementing multilateral environmental agreements (MEAs) for non-governmental organizations (NGOs). It covers key topics such as defining MEAs and their proliferation, basic information on selected MEAs, how MEAs enter into force internationally, and civil society participation in MEAs. The document also discusses the role of NGOs in MEA negotiations, national and regional preparations for MEA meetings, and networking strategies for NGOs. The overall aim is to help equip NGOs with useful information and guidance about engaging with the MEA process.