This paper reflects on the concepts of “peace constituency” and “peace infrastructure” and discusses the differences between both in the light of concrete cases. It argues that the first concept focuses on agency and the second one on structure. Additionally, the first one raises our attention to the importance for a strategic group of people to uphold a peacebuilding process (a point raised by Lederach through the metaphor of critical yeast), whereas the second one stresses the connections between people, institutions and/or mechanisms to sustain such a process (a point raised by Lederach through the metaphor of a cobweb).