The 9/11 attacks by Muslims on New York and Washington, D.C posed a question about canonical authority in Islam. Since Islam is ultimately based on the Qur’ān, it is crucial to define and assess the concept of canonization in Islam. Canonization as a theological concept consists of the principles according to which something is originally established and subsequently recognized by adherents as foundational standard for faith and practice. In this essay, Islamic canonization is contrasted with Evangelical canonization. The principles implicit in Islamic recognition of the Qur’ān as canon are observed, followed by the principles in Evangelical recognition of the Bible as canon.