This is the submitted version of a work that was accepted for publication in: The Lancet Psychiatry. A definitive version was subsequently published in The Lancet Psychiatry 2.11 (2015), DOI: 10.1016/S2215-0366(15)00332-6Mental and brain disorders represent the greatest health burden to Europe—not only for directly affected individuals, but also for their caregivers and the wider society. They incur substantial economic costs through direct (and indirect) health-care and welfare spending, and via productivity losses, all of which substantially affect European development. Funding for research to mitigate these effects lags far behind the cost of mental and brain disorders to society. Here, we describe a comprehensive, coordinated mental health research agenda for Europe and worldwide. This agenda was based on systematic reviews of published work and consensus decision making by multidisciplinary scientific experts and affected stakeholders (more than 1000 in total): individuals with mental health problems and their families, health-care workers, policy makers, and funders. We generated six priorities that will, over the next 5–10 years, help to close the biggest gaps in mental health research in Europe, and in turn overcome the substantial challenges caused by mental disordersThe research leading to these results has received funding from the European Commission’s Seventh Framework Programme (FP7, 2007–13) under grant agreement number 282586, and from the National R&D Internationalisation Programme of the Spanish Ministry of Science and Technology under Reference ACI-PRO-2011- 1080. TW and GT acknowledge financial support from the UK National Institute for Health Research (NIHR) Biomedical Research Centre and Dementia Unit awarded to South London and Maudsley National Health Service (NHS) Foundation Trust in partnership with King’s College London. GT is supported by the NIHR Collaboration for Leadership in Applied Health Research and Care South London at King’s College London Foundation Trust. TW is supported by an NIHR Senior Investigator Award

The importance of strengthening research on the implementation and dissemination of promotion, prevention and service delivery interventions in the mental health field needs to be emphasized. The complexity of mental health and its broader conceptualisation requires complementary research approaches and interdisciplinary collaboration to better serve the needs of the European population.