The Philippine Constitution is the supreme law of the Republic of the Philippines. Its final draft was completed by the Constitutional Commission on October 12, 1986, and ratified by a nationwide plebiscite on February 2, 1987. The preamble of the Constitution states that "We, the sovereign Filipino people, imploring the aid of Almighty God, in order to build a just and humane society and establish a Government that shall embody our ideals and aspirations, promote the common good, conserve and develop our patrimony, and secure to ourselves and our posterity the blessings of independence and democracy under the rule of law and a regime of truth, justice, freedom, love, equality, and peace, do ordain and promulgate this Constitution".

The current Constitution is the 1987 Constitution, which establishes the Philippines as a democratic and republican state. It provides for separation of powers among the legislative, executive, and judicial branches. The legislative power is vested in the Congress of the Philippines, which consists of a Senate and a House of Representatives. Congress enacts laws subject to the veto power of the President. The executive power is vested in the President, who ensures the faithful execution of the laws.

The Philippine legal system is a mix of civil law and common law traditions. The main sources of laws in the Philippines include the Constitution, treaties and conventions, statutes, and presidential issuances. The Constitution is divided into 18 articles, which cover a range of topics including the declaration of principles and state policies, citizenship, suffrage, the legislative, executive, and judicial branches, local government, and constitutional commissions.