This paper explores Arab public attitudes towards the proliferation of nuclear weapons across the Middle East. The results of the Arab Opinion Index presented here indicate that a majority of the Arab public has an in-principle opposition to the spread of nuclear weapons in the Middle East. Nonetheless, there are important caveats to this opposition: Israel’s present-day monopoly of nuclear weapons is a limiting factor to this principled opposition. Respondents to the survey, who also overwhelmingly view Israel as the country which poses the single greatest to regional security, contend that Israeli possession of nuclear weapons justifies other states in the region seeking to obtain them.