This document, as well as any data and any map included herein, are without prejudice to the status of or sovereignty over any territory, to the delimitation of international frontiers and boundaries and to the name of any territory, city or area. Please cite this paper as Forsberg, E. "Security actors in fragile contexts" OECD Development Cooperation Working Papers, No 75, OECD Publishing, Paris. This paper was written by Erik Forsberg based on input and insights from INCAF members and officials at a number of multilateral and non-governmental organisations, and academics, as well as existing literature and case studies. It was prepared under the oversight of Paloma Durán y Lalaguna, Head of Division, Cyprien Fabre, Acting Team Leader for Crises and Fragility, and Jonathan Marley, Policy Analyst, within the Global Partnerships and Policies Division of the Development Cooperation Directorate of the OECD. The paper has received valuable input from members of the Crises and Fragility team of the Global Policies and Partnerships Division at the Development Cooperation Directorate at the OECD. It was kindly peer reviewed by Rolf Schwarz from the Foresight Unit of the Development Cooperation Directorate of the OECD, and Hugo Slim from the Institute of Ethics, Law and Armed Conflict at the University of Oxford. Editing was done by David McDonald. Finally, the author would like to thank those who supported the work by generously sharing their insights and experiences through interviews and meetings, including members of INCAF, officials from multilateral agencies, bilateral donors, civil society organisations, researchers, and the members of the States of Fragility 2020 reference group.