A few weeks ago work on a Core Public Organisation Vocabulary (CPOV) started:
The Core Public Organisation Vocabulary aspires to become a common data model for describing public organisations in the European Union.
A Core Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of an entity in a context-neutral fashion. Core Vocabularies are the starting point for agreeing on new semantic interoperability assets and defining mappings between existing assets to guarantee a level of cross-domain and cross-border interoperability that can be attained by public administrations.
For more information see https://joinup.ec.europa.eu/asset/cpov/home