# Definitions 4(21) — GDPR — provision context

> Focused context for a single provision (4(21)), curated from overview.legal on 2026-08-22. Canonical: https://overview.legal/laws/gdpr/art-4#par-21
> Verify against the official text (EUR-Lex / wetten.overheid.nl) before relying on it.

Part of **Definitions** (GDPR, full article: https://overview.legal/laws/gdpr/art-4).

## Provision text

### 4(21)

‘supervisory authority’ means an independent public authority which is established by a Member State pursuant to Article 51;


## Topics on this provision

- **Public Authority** — https://overview.legal/topics/overheid
  Government bodies and their data processing activities
- **Public Sector** — https://overview.legal/topics/public-sector
  Processing by public authorities
- **Supervisory Authorities** — https://overview.legal/topics/supervisory-authorities
  National data protection authorities and their powers
- **Supervision** — https://overview.legal/topics/toezicht
  Oversight and enforcement by supervisory authorities

## Cited by (exact-provision citations)

- **Judgment of the Court (First Chamber) of 22 June 2023.#Proceedings brought by J.M.#Request for a preliminary ruling from the Itä-Suomen hallinto-oikeus.#Reference for a preliminary ruling – Processing of personal data – Regulation (EU) 2016/679 – Articles 4 and 15 – Scope of the right of access to information referred to in Article 15 – Information contained in log data – Article 4 – Definition of ‘personal data’ – Definition of ‘recipients’ – Temporal application.#Case C-579/21.** (case-law) — https://overview.legal/posts/132284
- **Judgment of the Court (First Chamber) of 22 June 2023.#Proceedings brought by J.M.#Request for a preliminary ruling from the Itä-Suomen hallinto-oikeus.#Reference for a preliminary ruling – Processing of personal data – Regulation (EU) 2016/679 – Articles 4 and 15 – Scope of the right of access to information referred to in Article 15 – Information contained in log data – Article 4 – Definition of ‘personal data’ – Definition of ‘recipients’ – Temporal application.#Case C-579/21.** ¶24 (case-law, Court of Justice of the European Union) — https://overview.legal/posts/132284
- **Guidelines 9/2022 on personal data breach notification under GDPR** (guidance) — https://overview.legal/posts/38058
- **Guidelines 9/2022 on personal data breach notification under GDPR** §4 (guidance, EDPB) — https://overview.legal/posts/38058

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Generated by overview.legal · https://overview.legal/laws/gdpr/art-4#par-21 · 2026-08-22