This article focuses on the security architecture of the Persian Gulf. Since the British left the Persian Gulf in 1971, maintaining the security of this strategic body of water has been a major concern for the governments of the region and for those who depend on energy supply from this region. Four decades later, after a revolution, three major wars, and regime changes in the region, defining a security system for the Persian Gulf remains a significant challenge. This article reviews the past security arrangements in the Persian Gulf and proposes a new framework for Persian Gulf security. Study of previous and current security patterns in the region reveal that the existing security frameworks have failed to ensure stability and led to massive direct military confrontations in the Persian Gulf. The authors argue that the failed strategies and theories of balance of power and arms race would intensify the atmosphere of mistrust and animosity in the region. They suggest that any meaningful security arrangement should involve all major regional actors of the Persian Gulf. They conclude that common security can only be achieved through comprehensive security architecture in the region. Although they insist that achieving this objective needs confidence-building measures to be considered by regional actors.