This publication outlines four communication approaches used by United Nations organizations: (i) behaviour change communication; (ii) communication for social change; (iii) communication for advocacy; and (iv) strengthening an enabling media and communications environment. The second part provides an in-depth exploration of Communication for Development efforts within seven United Nations agencies, programmes and funds: FAO, ILO, UNAIDS, UNDP, UNESCO, UNICEF and WHO, followed by case studies that demonstrate C4D in practice either as part of a larger project or as a ‘stand alone’ project contributing to the strategic objectives of the organization.