This report presents the findings of a bibliometric study of mental health research papers published from 1980 to 2008. The aim of this study was to map mental health research in the G20 and other leading countries in order to analyse i) the research productivity of nations; ii) the relative intensity of research; iii) the level of research (clinical or basic); iv) levels of scientific impact; and v) levels of collaboration. The work presented in this paper is the result of a collaboration between Observatoire des sciences et des technologies in Montreal and RAND Europe.