This essay starts by discussing the initial police involvement with newly reported sexual offences, covering local policing, problems with reporting to the police, police attitudes to complainants, and the role of sexual assault referral centres. The next section reviews police investigations of sexual offences, evidence gathering, and the role of forensic science and preparation for prosecution decisions. The author then explores the new role given to the police in their public protection role. This requires the police to take on supervisory activities, including administering the sex offender registry, applying for preventive civil orders, and disseminating information on sex offenders. The essay concludes by looking at the national and international policing of sexual offenders, including the policing of ‘sex tourism’.