The "Global School-based Student Health Survey (GSHS)" is a World Health Organization (WHO) and United States Centers for Disease Control and Prevention (CDC) collaborative effort in helping countries to assess ten behavioural risk and protective factors, including "alcohol use, dietary behaviours, drug use, hygiene, mental health, physical activity, protective factors, sexual behaviours, tobacco use, violence and unintentional injury" among adolescents. In this book, we deal with multiple behavioural non-communicable disease (NCD) risk factors in 15 countries: Philippines, Mozambique, Laos, Kuwait, Oman, Guatemala, Timor-Leste, Wallis and Futuna, Cook Islands, Afghanistan, Maldives, French Polynesia, Fiji, Bahrain and Benin. The results of the various papers will inform stakeholders of the relevance of school and youth health programmes and related policies targeting behavioural NCD risk factors in the adolescent population.