The fundamental reason to write this book is my strong conviction that there exists so much in common between Pakistan and Iran that these two neighbours deserve far better relations. This relationship started off on an upbeat note. Iran was the first state that recognized Pakistan following its independence in August 1947. The Pakistani government reciprocated the act in February 1979, when Islamabad Pioneered in recognizing the Islamic Republic of Iran subsequent to the Iranian Revolution. The bond of commonality between Pakistan and Iran runs through common history to common civilization and also through common faith to common culture and common borders. Surely, these relations have not always been smooth but still never remained extremely rough. Iran has all along supported Pakistan in crises. Pakistan too has been helped towards its neighbor in difficult times. This book is therefore an attempt to identify those common grounds which if genuinely discovered may bring Islamabad and Tehran well knitted to work for the betterment of the region. Through this book, I have endeavoured to analyse all conceivable factors and trends impacting these relations with a view to suggest the way forward for improvement in relations. It explores the state of strategic, economic, political, security, and other relations between the two neighbours. Also examined are the areas of convergence and divergence amongst these two states. This book will be useful to students of international relations, carrying out research on security politics of South Asia affecting Pakistan, Iran and Afghanistan. It will also be a good guide for policymakers/opinion-builders focusing on foreign affairs and security of Pakistan especially with regard to Iran and Afghanistan.