Objective: To review recent data on objectively measured overweight/obesity in national representative samples of European adolescents (aged 10-18 years), as well as availability of studies assessing trends in overweight/obesity in this target group. Attention was paid to the ability of the data to describe the obesity epidemic, especially in sociodemographic subgroups. Design/setting/subjects: Data on prevalence and trends in overweight/obesity among adolescents in the twenty-seven European Community member states, Iceland, Norway and Switzerland, available as scientific publications as well as reports or unpublished data by the end of 2009, were retrieved. Reports on the most recent objectively measured data from national representative samples were selected and described with regard to the years of data collection, sample sizes, response rates, age ranges included, trends by age, type of measures of overweight/obesity, sociodemographic variables and the sources of information. Results: Objectively measured data on national representative samples were identified for only half of the countries, and the trend studies were mainly conducted applying subnational samples. Most studies used the criteria from the International Obesity Task Force (IOTF) to define overweight/obesity, but the age ranges studied and the years of data collection varied, and information on sample sizes and response rates were often not presented. Data on trends of overweight/obesity over time are increasing, and the most recent studies indicate that the prevalence rate of overweight/obesity has stabilized. Few studies reported data by sociodemographic subgroups other than gender and age. Conclusions: Objectively measured data on national representative samples of adolescents appear scattered, and there is a large heterogeneity with respect to the quality and comparability of available data. Increasing use of the IOTF criteria for overweight/obesity contributes to improved comparability across studies. Data by sociodemographic subgroups, and in particular by socio-economic status, are scarce.Several scientific reports have shown that the obesity epidemic has reached children and adolescents in Europe. The reports suggest that there are clear geographic differences within the continent, with southern Europe and the British Isles reporting the highest prevalence rates of overweight/obesity among children and adolescents (1)(2)(3)(4) . In 2007, WHO Europe published a report on the challenge of obesity in Europe (1) . It was concluded that objectively measured and valid data on BMI were lacking for about half of the European countries. Furthermore, making comparisons between countries was difficult due to great variation in response rates, age ranges included, years of data collection and definition of overweight and obesity (1) . Considering the importance given to childhood obesity in the current public health discourse, as well as the urgent need to have high-quality