This chapter explores post-conflict diplomacy in the Iraq War by introducing the idea of “inter-conflict diplomacy,” or how the United States interacted and negotiated with different Iraqi power brokers while building an Iraqi state from the ground up and participating in ongoing military conflict. In contrast to claims that the United States “imposed” democracy there, it argues that US concerns over Iraqi sovereignty, as well as Iraqis’ assertions of their national sovereignty, limited the United States’ ability to reshape Iraqi politics and society. It provides case studies on the making of the Iraqi Constitution from 2003 to 2005 and the negotiations over the continued US role in Iraq after 2008 to illustrate this argument. Finally, it examines how the concept of “intra-conflict diplomacy” might usefully illuminate other US interventions where the boundaries of war, peace, sovereignty, and legitimate authority are disputed and fluid.