Scholarship on Pakistan’s relations with its neighbors predominantly focuses on India, Afghanistan and, most recently, China. Little research is conducted on relations between Pakistan and Iran. This is an obvious gap, given the cultural and religious links between these two neighbors that share a 909-kilometer border.1 Their relationship is often viewed as peripheral to Pakistan’s relations with the United States, Saudi Arabia, India, and Afghanistan.2 A prominent source on Pakistan’s foreign policy, Abdul Sattar’s Pakistan’s Foreign Policy 1947-2016: A Concise History, does not even dedicate a subsection to Iran.3 Furthermore, little attention has been given to the impact of domestic factors on Pakistan’s foreign-policy choices. Although some scholars have explored the role of identity,4 the interplay between domestic considerations and external behavior remains understudied. As will be argued below, this dynamic has a significant bearing on Pakistan’s policy on Iran and sheds light on behind-the-scene dynamics that are often overlooked.