In the multipolar order of the Middle East regional security complex as one of the most important and, at the same time, the most tensional security complexes of the international system, Iran and Saudi Arabia, as the most important countries in this complex, play a huge role in developments within the region. Among these factors such as: ideological conflicts, geopolitical and geo-economic rivalry, different views of the US role in the region, different perceptions of the rule of religion, power and justice, etc. have led to the pattern of competition between the two countries. But this model can be transformed into other models of relations between the two countries due to various variables and have different consequences on the security order in the Middle East. Therefore, the purpose of this study is to investigate the future of Iran-Saudi Arabia political relations and its consequences on the Middle East regional order. The question of this study is: What will be the consequences of the evolution of the Iran-Saudi Arabia behavior pattern on this order? This research is a descriptive research with a futuristic approach and uses the script writing method.