Corregidor ([ko.ɾɛ.hɪˈdoɾ], Tagalog: Pulo ng Corregidor, Spanish: Isla del Corregidor) is an island located at the entrance of Manila Bay in the southwestern part of Luzon in the Philippines, and is considered part of Cavite City and thus the province of Cavite. It is located 48 kilometres (30 mi) west of Manila, the nation's largest city and one of its most important seaports for centuries since the Spanish colonial period. Due to its strategic location, Corregidor has historically been fortified with coastal artillery batteries to defend the entrance of Manila Bay and Manila itself from attacks by enemy warships.

Corregidor (Fort Mills) is the largest of the islands that formed the harbor defenses of Manila Bay, together with El Fraile Island (Fort Drum), Caballo Island (Fort Hughes), and Carabao Island (Fort Frank), which were all fortified during the American colonial period. The island was also the site of a small military airfield, as part of the defense.

During World War II, Corregidor played an important role during the invasion and liberation of the Philippines from the Imperial Japanese Army. The island was heavily bombarded during the later part of the war, and the ruins serve as a military memorial to American, Filipino, and Japanese soldiers who served and lost their lives on the battlefield. Corregidor is both a major historical site and one of the busiest tourist attractions in the Philippines.