Why did Turkey and Iran fail to become close partners in the 1970s even though they had compelling reasons to do so? This article argues that mutual distrust between Turkish and Iranian leaders, domestic turmoil in the two countries, and diverging geostrategic priorities undermined Ankara and Tehran's efforts to deepen their relations. While the shah of Iran saw his country as the policeman of the Persian Gulf and the Middle East, successive governments in Turkey continued to look west for their security. As economic and political turmoil engulfed the two countries, leading to a revolution in Iran in 1979 and a coup in Turkey in 1980, Iranian and Turkish leaders could not forge a lasting partnership.