This article presents the results of an international survey of European correctional treatment programmes for young offenders. Questionnaires gathering data on programmes’ design, implementation, structure, and evaluation were collected from 112 programme administrators in 25 European Union countries. Results demonstrated that although there was a commitment to young offender rehabilitation in almost every country, programmes adopted many different approaches and were implemented with varying levels of adherence to evidence-based principles of ‘best practice.’ The majority of programmes adopted a cognitive-behavioural approach, and clinical discretion was prioritised over systematised, empirically validated assessment instruments. Most programmes were administered by centralised government agencies; however, process and outcome evaluation was rare. These findings suggest a strong need for improved systematic evaluation in most European countries.