The national flag of the Philippines is a horizontal bicolor with equal bands of blue and red, and with a white equilateral triangle based at the hoist side; in the center of the triangle is a golden yellow sun with eight primary rays, each containing three individual rays; and at each corner of the triangle is a five-pointed golden yellow star. The flag is displayed with the blue field on top in times of peace, and with the red field on top in times of war.

The Philippine flag was first conceptualized by General Emilio Aguinaldo in 1897 during his exile in Hong Kong, drawing inspiration from the flags used by the Katipunan and the Cuban revolutionaries. The first flag was sewn by Marcela Agoncillo, her daughter Lorenza, and Doña Delfina Herbosa de Natividad, niece of José Rizal, the Philippines' national hero.

The flag was formally unfurled during the proclamation of independence on June 12, 1898 in Kawit, Cavite. However, a Manila Times article by Augusto de Viana, Chief History Researcher, National Historical Institute, mentions assertions in history textbooks and commemorative rites that the flag was first raised in Alapan, Imus, Cavite, on May 28, 1898, citing Presidential Proclamation No. 374, issued by then-President Diosdado Macapagal on March 6, 1965.