Linking scientific knowledge with political decision-making has never been an easy task. This is also the case in the forestry sector, especially with its wide array of stakeholders at local, national, and global levels. Considerable constraints appear to exist in translating innovative ideas generated through science into practical application for policy-making and on-the-ground forest management. Over the past few years, the International Union of Forest Research Organizations (IUFRO) therefore has addressed the issue of the science–policy interface through in-depth study by a special task force, and by providing training on the subject for the forest science community in developing countries. This paper reports on the results and ongoing activities of these IUFRO initiatives, including a best practices guide on how to work effectively at the interface of forest science and forest policy and a training program that has been implemented in Africa, Asia, and Latin America over the past few years. As an example of successful training in science–policy interfacing, we present results of a workshop focused on mountain forestry development. This workshop was organized for scientists from developing countries in Africa and Asia in conjunction with the International Conference on “Mountain Forests in a Changing World” held in Vienna, Austria, in April 2008. Experiences gained in implementing the training on science–policy interfacing for scientists from developing countries show that interaction between the science community and decision-makers is very limited. Although in some developing countries there are established formal processes for reporting research results to the government at higher levels, greater efforts in terms of resources and awareness creation are required for more effective integration of scientific knowledge into policy-making. The science–policy guidelines and training presented in this paper are an essential step toward this end.