| La Riera de Gaià | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Catalonia |
| Pushpin Map1: | Spain |
| Pushpin Map Caption: | Location in Catalonia |
| Pushpin Map Caption1: | Location in Spain |
| Coordinates: | 41.1678°N 1.3619°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Tarragona |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Tarragonès |
| Leader Title: | Mayor |
| Leader Name: | Jaume Casas Sorde (2015)[1] |
| Area Footnotes: | [2] |
| Area Total Km2: | 8.8 |
| Elevation M: | 28 |
| Population Density Km2: | auto |
| Population Demonym: | Rierenc |
| Postal Code Type: | Postal code |
| Postal Code: | 43762 |
La Riera de Gaià (in Catalan; Valencian pronounced as /lə riˈeɾə ðə ɣəˈja/) is a municipality in the comarca of the Tarragonès in Catalonia, Spain.