Purpose: The aim of this literature review is to summarise and synthesise the research base concerning childhood obesity and physical activity, particularly in relation to teachers and schools and within a policy context of the UK. The review investigates childhood obesity, physical activity, physical education, the role of teachers, the role of schools and physical activity in the classroom. Design/methodology/approach: A literature review was undertaken involving selection of primary research and other systematic reviews. A computer search was performed using a combination of keywords including: obesity, prevention, intervention, preventive, teachers, schools, healthy schools, role models, physical activity, physical education, active school, active classroom. The review also includes samples of media coverage of the issue. Findings: This review highlights the complex and ambiguous nature of the evidence in relation to this important contemporary issue. Originality/value: A limited understanding of childhood obesity is evident from the review and this precludes definitive conclusions in relation to almost all aspects of the agenda. More quality research is needed in almost all areas of the topic, including areas such as the engagement of schools and teachers. (Contains 2 tables.)