Relevant authorities to file a complaint to:
Austria: Datenschutzbehörde
Belgium: Autorité de protection des données / Gegevensbeschermingsautoriteit
Bulgaria: Commission for Personal Data Protection
Croatia: Croatian Personal Data Protection Agency
Cyprus: Office of the Commissioner for Personal Data Protection
Czech Republic: The Office for Personal Data Protection
Denmark: Danish Data Protection Agency
Estonia: Estonian Data Protection Inspectorate
Finland: Office of the Data Protection Ombudsman
France: Commission nationale de l’informatique et des libertés (CNIL)
Germany: Federal Commissioner for Data Protection and Freedom of Information
Greece: Hellenic Data Protection Authority
Hungary: National Authority for Data Protection and Freedom of Information
Iceland: Icelandic Data Protection Authority
Ireland: Data Protection Commission
Italy: Garante per la protezione dei dati personali
Latvia: Data State Inspectorate
Lithuania: State Data Protection Inspectorate
Luxembourg: National Commission for Data Protection
Malta: Office of the Information and Data Protection Commissioner
Netherlands: Autoriteit Persoonsgegevens
Poland: Personal Data Protection Office / Urząd Ochrony Daty Osobowych
Portugal: Comissão Nacional de Proteção de Dados
Romania: National Supervisory Authority for Personal Data Processing
Slovakia: Office for Personal Data Protection of the Slovak Republic
Slovenia: Information Commissioner
Spain: Agencia Española de Protección de Datos
Sweden: Swedish Authority for Privacy Protection
Liechtenstein: Data Protection Office
Norway: Norwegian Data Protection Authority
Switzerland: Federal Data Protection and Information Commissioner (FDPIC)