| Official Name: | Río Piedras Antiguo |
| Settlement Type: | Subbarrio |
| Pushpin Map: | Puerto Rico |
| Coordinates: | 18.3998°N -66.0499°W |
| Subdivision Type: | Commonwealth |
| Subdivision Name: |  Puerto Rico |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | San Juan |
| Subdivision Type2: | Barrio |
| Subdivision Name2: | Pueblo |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | .06 |
| Area Land Sq Mi: | .06 |
| Population As Of: | 2010 |
| Population Note: | Source: 2010 Census |
| Population Total: | 445 |
| Population Density Sq Mi: | 7416.7 |
| Timezone: | AST |
| Utc Offset: | -4 |
| Elevation Ft: | 98 |
Río Piedras Antiguo is one of the 6 subbarrios[1] of Pueblo, a barrio in San Juan, Puerto Rico.[2] It was, at one time, a subdivision of Río Piedras, a former municipality of Puerto Rico.