These are authorities that supervise the implementation of GDPR in each of the EU member countries:
| Country | Supervisory Authority | Website |
| Austria | Österreichische Datenschutzbehörde | www.dsb.gv.at |
| Belgium | Commission de la protection de la vie privée | www.privacycommission.be |
| Bulgaria | Commission for Personal Data Protection | www.cpdp.bg |
| Croatia | Croatian Personal Data Protection Agency | www.azop.hr |
| Cyprus | Commissioner for Personal Data Protection | www.dataprotection.gov.cy |
| Czech Republic | The Office for Personal Data Protection | www.uoou.cz |
| Denmark | Datatilsynet | www.datatilsynet.dk |
| Estonia | Estonian Data Protection Inspectorate (Andmekaitse Inspektsioon) | www.aki.ee/en |
| Finland | Office of the Data Protection Ombudsman | www.tietosuoja.fi/en |
| France | Commission nationale de l’informatique et des libertés – CNIL | www.cnil.fr |
| Germany | Die Bundesbeauftragte für den Datenschutz und die Informationsfreiheit | www.bfdi.bund.de |
| Greece | Hellenic Data Protection Authority | www.dpa.gr |
| Hungary | National Authority for Data Protection and Freedom of Information | www.naih.hu |
| Ireland | Data Protection Commissioner | www.dataprotection.ie |
| Italy | Garante per la protezione dei dati personali | www.garanteprivacy.it |
| Latvia | Data State Inspectorate | www.dvi.gov.lv |
| Lithuania | State Data Protection | www.ada.lt |
| Luxembourg | Commission nationale pour la protection des données | www.cnpd.lu |
| Malta | Office of the Data Protection Commissioner | www.dataprotection.gov.mt |
| Netherlands | Autoriteit Persoonsgegevens | www.autoriteitpersoonsgegevens.nl |
| Poland | The Bureau of the Inspector General for Personal Data Protection – UODO | www.uodo.gov.pl/ |
| Portugal | Comissão Nacional de Protecção de Dados – CNPD | www.cnpd.pt |
| Romania | The National Supervisory Authority for Personal Data Processing | www.dataprotection.ro |
| Slovakia | Office for Personal Data Protection of the Slovak Republic | www.dataprotection.gov.sk |
| Slovenia | Information Commissioner | www.ip-rs.si |
| Spain | Agencia de Protección de Datos | www.agpd.es |
| Sweden | Datainspektionen | www.datainspektionen.se |
| United Kingdom | The Information Commissioner’s Office | www.ico.org.uk |