This paper was commissioned by the German Federal Ministry for Economic Cooperation and Development (BMZ) in 2015, and produced by the Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, in cooperation with German civil society actors and freelance psychologists working in the field of Mental Health and Psychosocial Support (MHPSS) with refugees and internally displaced people (IDP) in both the Middle Eastern region and Germany. The commission arose from BMZ’s wish for guidance on the characteristics of good working practices in MHPSS and the desire expressed by GIZ’s civil society partners in the regional programme Psychosocial Support for Syrian and Iraqi Refugees and Internally Displaced People for more intensive dialogue to promote MHPSS in the context of the Syria and Iraq crises.