Recent case studies suggest that states highly motivated to obtain nuclear weapons will eventually succeed. If Iran manages to go nuclear, as Israel, India, Pakistan, and North Korea have done, what will the Arabian Gulf region look like after Tehran acquires these weapons? This thesis investigates the likely responses of Israel, the Arab Gulf States, and Pakistan to an Iran armed with nuclear weapons. A detailed examination of regional statements and media analysis shows that the region will likely not be further unbalanced. Instead, these states will pursue rational responses to diminish any Iranian threats.