This chapter presents two Spanish case studies: community water management and good practices to avoid animal diseases. Communities of irrigators (CR) are established by owners of irrigated land who are collectively granted a water concession. They manage resources locally following their own water allocation rules. Animal Health Associations (ADGs) are created by local livestock breeders who implement a common animal health programme. Following a brief description of the case studies, the agri-environmental public goods provided by collective action, the roles of participants, the factors affecting outcomes in collective action and the policy measures in support of collective action are discussed.