This research examines the historical and legal evolution of constitutional judicial bodies in Egypt, Iraq, and Iran, illustrating how these systems transitioned from traditional forms of political or judicial oversight into specialized constitutional institutions. In Egypt, the Supreme Constitutional Court emerged in 1979 as a model for independent, *a posteriori* (subsequent) judicial review. In Iraq, the federal and democratic system was bolstered by the establishment of the Federal Supreme Court under the 2005 Constitution. As for Iran, oversight takes a unique form through the "Guardian Council"—established in 1979—which combines constitutional review with the verification of compliance with Islamic law (*Sharia*) prior to the enactment of legislation. The study asserts that constitutional adjudication in these nations reflects significant constitutional transformations and serves as a vital mechanism for upholding the supremacy of the constitution and protecting rights and freedoms, notwithstanding the differences in the underlying philosophies that each system employs in exercising such oversight.