Iran stands in second position among the countries that have gas reserves after Russia and has a high potential for providing noticeable amount of Europe natural gas demand. There are a variety of routes for Iran’s gas export including Iran-Turkey-Greece and Iran-Iraq-Syria-Lebanon-Greece. We have analysed the Nash- equilibrium for trilateral game in Iran’s gas transit from Turkey and Iraq in 2020 and 2030 perspective under two cooperative and noncooperative strategies. We have concluded that if the three countries participate in a trilateral cooperation, the Nash equilibrium will take place and their profits will be maximized.