January 2020 Grace Ryan, 1 Valentina Iemmi, 2 Fahmy Hanna, 3 Hannah Loryman 4 and Julian Eaton 5 1 London School of Hygiene and Tropical Medicine 2 London School of Economics and Political Science 3 World Health Organization 4 Sightsavers 5 CBM International and London School of Hygiene and Tropical Medicine Mental Health for Sustainable Development A Topic Guide for Development Professionals