There is a great potential for mutual beneficial synergies between the two fields of Collaborative Networks and Sustainability science. This potential has in fact been recognized in many fields where these synergies are leading to novel approaches and solutions. It is particularly evident that the challenges of sustainability call for a wide collaboration among multiple stakeholders, as the needed changes exceed the capacity and capability of individual actors. With the purpose to illustrate the possible contribution and challenges for collaborative networks in sustainability, a number of relevant cases where examples of such synergies are already identified are briefly introduced.