Caluco is a city and municipality in the Sonsonate department of El Salvador. According to the 2007 Population and Housing Census, it has a population of 9,139.
Caluco was a producer of cocoa.
Caluco, which in colonial times was at the peak of Salvadoran cocoa production and export, also holds a treasure of cultural heritage: the ruins of the first church in El Salvador.
The municipality is 51.43 km<sup>2</sup> (19.86 mi<sup>2</sup>) large.