ICO publishes new anonymisation and pseudonymisation guidance

31/03/2025 | ICO

The Information Commissioner's Office (ICO) has published new guidance on anonymisation and pseudonymisation techniques. The guidance is aimed at helping organisations seeking to anonymise personal data for any purpose and focuses on implementing robust accountability and governance measures. The guidance covers:

  • Definitions of anonymisation and pseudonymisation.
  • The impact on data protection obligations and responsibilities.
  • Key considerations for anonymising personal data.
  • Best practices for anonymisation.
  • Technical and organisational measures to mitigate risks.

The guidance addresses anonymisation within the context of general processing under the UK General Data Protection Regulation (GDPR) and Part 2 of the Data Protection Act 2018 (DPA18), law enforcement processing under Part 3 of the DPA18, and intelligence services processing under Part 4 of the DPA18.

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Anonymity, anonymisation, pseudonymisation, right to be forgotton

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