To understand Oman’s role in regional negotiation, mediation, and conflict resolution is to appreciate its foreign policy. Oman’s foreign policy is evaluated to understand how it has been formed and in what way this has impacted its political stances throughout the years of the late Sultan Qaboos bin Said’s reign. In a turbulent region, Oman has consequently been asked on several occasions to serve as a negotiator or mediator. This research examines how Oman has done it. The US-Iranian conflict is presented to answer the raised question, along with many areas in relation. Emphasizing on trust as a vital element to a successful intervention, Oman’s peacemaking diplomacy under an independent, pragmatic, and moderate manner is elaborated. The durability of Oman’s position in regional and global negotiation and mediation is finally measured, presenting the impact of such on its security needs and regional stability.