Iloilo, officially the Province of Iloilo, is a province in the Philippines located in the Western Visayas region. Its capital and largest city is Iloilo City, the regional center of Western Visayas. Iloilo occupies the southeast portion of the Visayan island of Panay and is bordered by the province of Antique to the west, Capiz to the north, the Jintotolo Channel to the northeast, the Guimaras Strait to the east, and the Iloilo Strait and Panay Gulf to the southwest.

Panay is the sixth-largest and fourth-most populous island in the Philippines, with a total land area of 12,011 km2 (4,637 sq mi) and has a total population of 4,542,926 as of 2020 census. Panay comprises 4.4 percent of the entire population of the country. The City of Iloilo is its largest settlement with a total population of 457,626 inhabitants as of 2020 census.