Article 51 - Supervisory authority
4 preliminary rulingsJudgment of 30 Apr 2025, C-313/23 (Inspektorat kam Visshia sadeben savet) 
Article 51 of Regulation 2016/679 must be interpreted as meaning that a court having jurisdiction to authorise disclosure of personal data to another judicial body does not constitute a supervisory authority within the meaning of that article, where that court is not entrusted by the Member State in which it is situated with monitoring the application of that regulation in order to protect, in particular, the fundamental rights and freedoms of natural persons in relation to the processing of their personal data.
Judgment of 16 Jan 2024, C-33/22 (Österreichische Datenschutzbehörde)
Article 77(1) and Article 55(1) of Regulation 2016/679 must be interpreted as meaning that, where a Member State has chosen, in accordance with Article 51(1) of that regulation, to establish a single supervisory authority, without, however, conferring on it the competence to monitor the application of that regulation by a committee of inquiry set up by that Member State’s parliament in the exercise of its power of scrutiny over the executive, those provisions directly confer on that authority the competence to hear complaints relating to the processing of personal data by that committee of inquiry.
Judgment of 4 Jul 2023, C-252/21 (Meta Platforms and Others)
Article 51 et seq. of Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation), as well as Article 4(3) TEU must be interpreted as meaning that, subject to compliance with its duty of sincere cooperation with the supervisory authorities, a competition authority of a Member State can find, in the context of the examination of an abuse of a dominant position by an undertaking within the meaning of Article 102 TFEU, that that undertaking’s general terms of use relating to the processing of personal data and the implementation thereof are not consistent with that regulation, where that finding is necessary to establish the existence of such an abuse. In view of this duty of sincere cooperation, the national competition authority cannot depart from a decision by the competent national supervisory authority or the competent lead supervisory authority concerning those general terms or similar general terms. Where it has doubts as to the scope of such a decision, where those terms or similar terms are, simultaneously, under examination by those authorities, or where, in the absence of an investigation or decision by those authorities, the competition authority takes the view that the terms in question are not consistent with Regulation 2016/679, it must consult and seek the cooperation of those supervisory authorities in order to dispel its doubts or to determine whether it must wait for them to take a decision before starting its own assessment. In the absence of any objection on their part or of any reply within a reasonable time, the national competition authority may continue its own investigation;
Judgment of 5 Jun 2018, C-210/16 (Wirtschaftsakademie Schleswig-Holstein)
Articles 4 and 28 of Directive 95/46 must be interpreted as meaning that, where an undertaking established outside the European Union has several establishments in different Member States, the supervisory authority of a Member State is entitled to exercise the powers conferred on it by Article 28(3) of that directive with respect to an establishment of that undertaking situated in the territory of that Member State even if, as a result of the division of tasks within the group, first, that establishment is responsible solely for the sale of advertising space and other marketing activities in the territory of that Member State and, second, exclusive responsibility for collecting and processing personal data belongs, for the entire territory of the European Union, to an establishment situated in another Member State.
Article 4(1)(a) and Article 28(3) and (6) of Directive 95/46 must be interpreted as meaning that, where the supervisory authority of a Member State intends to exercise with respect to an entity established in the territory of that Member State the powers of intervention referred to in Article 28(3) of that directive, on the ground of infringements of the rules on the protection of personal data committed by a third party responsible for the processing of that data whose seat is in another Member State, that supervisory authority is competent to assess, independently of the supervisory authority of the other Member State, the lawfulness of such data processing and may exercise its powers of intervention with respect to the entity established in its territory without first calling on the supervisory authority of the other Member State to intervene.
