The concept of sustainable development was defined and codified in 1987 with the World Commission on Environment and Development report. Since then, there has been a proliferation of processes, regimes, negotiations, activities, and collaborations aimed at aspects of sustainable development (or a portfolio of ambitions such as those embodied in the Sustainable Development Goals). Recognizing the complexity of global systems intertwined with the pursuit of sustainable development, diplomatic practitioners and scholars proposed a new approach and practice to facilitating international cooperation: sustainable development diplomacy (SD diplomacy). While SD diplomacy presents a compelling perspective and systems-like approach, the concept is still relatively nascent and lacks connectivity to related scientific fields such as international relations, multi-party negotiation, and conflict resolution. This thesis aims to strengthen SD diplomacy as a theory and a practice. It does so by qualitatively examining a cross-section of multi-actor processes in sustainable development: the intergovernmental negotiations on climate change under the United Nations Framework Convention on Climate Change (UNFCCC); inter-governmental and multi-stakeholder processes on reducing emissions from deforestation and degradation (REDD+); and multi-stakeholder roundtables on sustainable beef. In the UNFCCC and REDD+ contexts, the focus is on negotiation dynamics with an eye towards understanding how those dynamics enable and/or constrain multi-actor agreement. The beef roundtables context focuses on understanding early implementation characteristics that serve as the foundation for driving sustainability impact. Finally, the thesis explores early implementation characteristics of multi-stakeholder processes on REDD+. The results of the analyses inform an Integrated Negotiation Dynamics Model and consideration of multi-stakeholder market driven approaches to sustainability. The synthesized results are then utilized to inform and enhance the field of SD diplomacy.