Here we introduce the first major attempt to present a comprehensive image of the Greek Social Economy. Existing institutional forms such as Associations, Foundations, Mutual Funds and Cooperatives, along with several other non-juridical persons are presented in-depth. Their history is discussed in relation to the formation of the modern Greek state. A detailed institutional context regarding establishment and operation for each one of the abovementioned types is provided. Along, we introduce core conceptualizations and methodology of national- accounting over the Social Economy as already applied internationally. Our main aim is to provide with a solid methodological basis for an eventual drawing up of a Greek Social Economy Satellite Account. We introduce a comprehensive, detailed Social Economy Register for Greece. It includes all relevant institutional rules governing Social Economy. We register all public and private institutions auditing Social Economy and present a basic nomenclature of Social Economy Institutions in Greece, according to national-accounting provisions as set by International and European Systems of Accounts.