Alison Schafer and Mark van Ommeren, World Health Organization, discuss what is meant by mental health and psychosocial support, why this should be prioritised in emergency contexts, the rationale for doing more and doing better, and highlight where organisations can go for further advice and support. This video was produced in Summer 2019, for DFID staff, as part of the K4D Learning Journey “Leave No One Behind”: Delivering on the 2030 Sustainable Development Agenda for Mental Health and Psychosocial Disabilities.