Constitution of the Arab Union

The Constitution of the Arab Union (Arabic: دستور الاتحاد الجمهوريات العربية dustūr al-ittiḥād al-jumhūriyāt al-‘arabīyah) is the supreme law of the Union of Arab Republics (UAR; informally known as the Arab Union). The constitution was signed on 14 September 1999 by the Arab Congress, and ratified the following day by the Constitutional Council of the Supreme Court of the Arab Union, replacing the 1958 constitution.

As the foundational document of the basic law of a federation, the constitution identifies, delineates, and intentionally separates the areas of jurisdiction of the federal government and the republics (referred to by the constitution as "Arab Republics"). The constitution lists by name the 20 republics which make up the union, outlining the practical structure of both a republic's government and the federal government; as the structure of republican governments are identical, the Constitution of the Arab Union acts also as the constitution of each of the 20 republics, which do not have their own separate constitutions and thus derive all legitimacy and legality from the unique constitution.