The register of data controllers was a United Kingdom database under the control of the UK Information Commissioner's Office (ICO) mandated by section 19 of the Data Protection Act 1998.: Section 19
The register of fee payers is the name of an equivalent register established under the Data Protection Act 2018, which implements the European Union's General Data Protection Regulation (GDPR).
Registration under either Act carries a fee, the proceeds of which fund the costs of the ICO. Any entry may be inspected by the public at any time at no cost to the enquirer.