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|Former province of the Philippines|
|•||Established||June 18, 1966|
|•||Disestablished||February 14, 1995|
|Today part of||Kalinga and Apayao|
Kalinga-Apayao was a province of the Philippines in the Cordillera Administrative Region in the island of Luzon. It was divided into the two provinces of Kalinga and Apayao with the passage of Philippine Republic Act No. 7878 on February 14, 1995. This RA amended the earlier Republic Act No. 4695, passed on June 18, 1966, which formed the provinces of Kalinga-Apayao, Benguet, Ifugao, and Mountain Province, from the earlier Mountain Province.
During the Second World War, Japanese fighter and bomber planes invaded the province of Kalinga-Apayao. The bombings and air raids destroyed the towns and municipalities on December 1941 during the Japanese Invasion of the Philippines. This happened prior to Japanese air raid at Camp John Hay in Baguio City on December 8, 1941. The soldiers of the Japanese Imperial Army occupied provinces of Kalinga-Apayao.
The Igorot and Cordilleran soldiers of the 11th Infantry Division, Philippine Commonwealth Army, USAFFE, endured four months of battle culminating in their surrender to the Japanese on April 9, 1942.
Many Igorot and Cordilleran men and women joined the group of local guerrilla resistance fighters in Kalinga-Apayao which fought against the Japanese Imperial forces in Northern Luzon. Meanwhile, many Igorot and Cordilleran men joined the Philippine Commonwealth Army under the U.S. Military Command.
The establishment of the military general headquarters and military camp bases of the Philippine Commonwealth Army and the United States Armed Forces in the Philippines - Northern Luzon or USAFIP-NL was active on 1942 to 1946 and the Philippine Constabulary was active on 1944 to 1946 in the province of Kalinga-Apayao. The Philippine Commonwealth army and Philippine Constabulary deployed special operations units in Kalinga-Apayao to aid in the campaign against the Japanese Imperial Army. Alongside with the aid sent, both the Makapili rebel fighters soldiers of the Philippine Commonwealth army and Philippine Constabulary started the First and Second Battle of Kalinga-Apayao or Kalinga-Apayao Campaign from 1942 to 1945.