Algarrobo (Spanish pronunciation: [alɣaˈroβo]) is a Chilean city and commune in San Antonio Province, Valparaíso Region.

The San Alfonso del Mar resort, located north of the city, is home to the world's largest outdoor pool.

[5] Islote Pájaros Niños is a nature sanctuary on a rocky islet close to the shore, which is home to colonies of Humboldt penguins, Peruvian pelicans, and Guanay cormorants.

[6] According to the 2002 census of the National Statistics Institute, Algarrobo spans an area of 175.6 km2 (68 sq mi) and has 8,601 inhabitants (4,369 men and 4,232 women).

[2] As a commune, Algarrobo is a third-level administrative division of Chile administered by a municipal council, headed by an alcalde who is directly elected every four years.