Complexity is an inherent hallmark of macro-social marketing with its remit of doing social good, changing behaviours, and improving the quality of our lives. Complexity in macro-social marketing looks to leverage, among other things, three critical concepts. To start, there is a broadened stakeholder mindset where citizen and stakeholder behaviours are not seen as separate from their context or surrounding relationships and structures. Indeed, they are understood and treated as interrelated, interconnected, and intertwined. There is also a participation philosophy. It adopts a multifaceted and multi-level approach to change as central to success. Finally, there is value co-creation. When a broadened stakeholder mindset is empowered by deep and active participation, the processes of value co-creation—value co-discovery, value co-design, and value co-delivery—can manifest social value and systemic transformation. However, a word of caution, avoiding these complexities of macro-social marketing, societal stakeholders, democratic participation, and value co-creation won’t make intractable global-to-local problems go away or their resolution any easier.