| Lafu Island | |
| Map Relief: | yes |
| Location: | Cagayan River |
| Coordinates: | 18.1831°N 121.6414°W |
| Country: | Philippines |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Cagayan Valley |
| Country Admin Divisions Title 1: | Province |
| Country Admin Divisions 1: | Cagayan |
| Country Admin Divisions Title 2: | Municipality |
| Country Admin Divisions 2: | Lal-lo |
| Population: | 805 |
| Population As Of: | 2020 |
Lafu Island, also known as San Antonio Island, is a small island–barangay situated on the Rio Grande de Cagayan in northern Luzon, Philippines. It is administratively part of the municipality of Lal-lo in Cagayan province and is coterminous with the rural village of San Antonio.[1]
According to the 2020 census, it has a population of 805 people.[2] It is located south of Fabrica, east of Malanao and Catugan, and west of Tucalana and Catayuan. The Magapit Suspension Bridge can be found some two kilometers south of the island.[3]