Quebrada Arenas, San Juan, Puerto Rico
Quebrada Arenas is one of the 18 barrios of the municipality of San Juan, Puerto Rico. Located in the southwest corner of San Juan, it is the only rural barrio in the municipality. Quebrada Arenas is totally outside San Juan's municipal urban zone according to the last census. In 2010 it had a total population of 2,747 inhabitants, and a land area of , resulting in a population density of only 1,116.7 residents per square mile (431.2 km²), the lowest for any barrio in San Juan.

The barrio of Quebrada Arenas has boundaries with the municipalities of Aguas Buenas and Caguas to the south, with Guaynabo to the west, and is bounded by the barrios of Caimito to the east and Tortugo to the north.