Farmers’ organisations (FOs) are increasingly being asked to play a central role in driving agricultural transformation processes in Sub-Saharan Africa, despite their mixed record of success. As governments, donors and NGOs rush to promote the scaling up and diversification of FOs’ activities and membership, this policy brief draws on findings of a study of the roles, functions and performance of FOs in Ethiopia, Kenya and Malawi to suggest some principles and practices for supporting FOs in Africa.