This brief guidance note seeks to provide advice on protecting and supporting the mental health and psychosocial wellbeing of refugees, asylum-seekers and migrants in Europe. It describes key principles and appropriate interventions to guide all those who are designing and organizing emergency services and/or providing direct assistance to the affected people. This guide focuses on psychological first aid, which involves humane, supportive and practical help to fellow human beings suffering serious crisis events. It is written for people who can help others experiencing an extremely distressing event.