This paper uses the findings of the 2015 Arab Opinion Index to gauge Arab public attitudes towards the “Joint Comprehensive Plan of Action”, the international agreement which brought to a close a world crisis over Iran’s nuclear program. The paper also explores Arab attitudes towards the possibility of Iranian non-compliance with the terms of the agreement as well as the possible transformation of Iran into a nuclear capable state. The findings reflect a sharp division within Arab public opinion: 43% of respondents expressed the belief that Iran would abide by the terms of the agreement, with 46% predicting that the country would not follow through with the terms of the multilateral treaty.