This article introduces the official providers of developing co-operation from beyond the membership of the Organization for Economic Co-operation and Development (OECD) Development Assistance Committee. In Section 2, it provides an overview of their volumes of development co-operation and key features, distinguishing between ‘emerging donors’, ‘providers of South-South Development Co-operation’ and ‘Arab donors’. Section 3 offers insights into the opportunities and risks brought by their growing presence in developing countries. Section 4 examines their impact on the international development co-operation system, which is under increasing pressure to become more inclusive. The concluding section takes an optimistic look at the growing opportunities for mutual learning and collaboration between all providers of development co-operation. Copyright © 2011 John Wiley & Sons, Ltd.