Martial law in the Philippines refers to the various historical instances in which the Philippine head of state placed all or part of the country under military control—most prominently during the administration of Ferdinand Marcos, but also during the Philippines' colonial period, during the second world war, and more recently on the island of Mindanao during the administrations of Gloria Macapagal Arroyo and Rodrigo Duterte. The alternative term "martial law era" as applied to the Philippines is typically used to describe the Marcos martial law period specifically.

At 7:15 p.m. on September 23, 1972, President Ferdinand Marcos announced on television that he had placed the Philippines under martial law, stating he had done so in response to the "communist threat" posed by the newly founded Communist Party of the Philippines (CPP), and the sectarian "rebellion" of the Muslim Independence Movement (MIM). Opposition figures of the time accused Marcos of exaggerating these threats and using them as an excuse to consolidate power and extend his tenure beyond the two presidential terms allowed by the 1935 constitution. Marcos' signed Proclamation No. 1081 on September 21, 1972, marking the beginning of a fourteen-year period of one-man rule which effectively lasted until Marcos was exiled from the country on February 25, 1986. Proclamation No. 1081 was formally lifted on January 17, 1981, although Marcos retained essentially all of his powers as dictator until he was ousted in February 1986.