In the United Kingdom, the Violent and Sex Offender Register (ViSOR) is a database of records of those required to register with the police under the Sexual Offences Act 2003 (the 2003 Act), those jailed for more than 12 months for violent offences, and those thought to be at risk of offending. In response to a Freedom of Information request in 2009, for example, Greater Manchester Police reported that of 16 people in their area placed on ViSOR since 2007 on their initiative and not as a result of a relevant conviction, four (25%) had clean criminal records.

The Register can be accessed by the police, National Probation Service, and HM Prison Service personnel. Private companies running prisons are also granted access. It used to be managed by the National Policing Improvement Agency of the Home Office, but this was replaced by the National Crime Agency on 7 October 2013, as a feature of the Crime and Courts Act 2013, which also formally abolished the NPIA.

In April 2021, amendments were proposed to the Domestic Abuse bill to add serial domestic abusers and stalkers to the register, to give family court judges training on dealing with sexual abuse and to provide greater protection for migrant domestic violence victims. Despite the government suggesting support following the killing of Sarah Everard, all but two Conservative MPs voted down these amendments to the bill.