| Gaià | |
| Source1 Location: | Santa Coloma de Queralt |
| Mouth Location: | Mediterranean Sea |
| Subdivision Type1: | Country |
| Subdivision Name1: | Spain |
| Length: | 59km (37miles) |
| Mouth Elevation: | 0m (00feet) |
| Discharge1 Avg: | 0.57m3/s |
| Basin Size: | 423.8km2 |
The Gaià (in Catalan; Valencian pronounced as /gəˈja/) is a 59 km long river in Tarragona Province, Catalonia.
Its source is at Santa Coloma de Queralt, situated in the Catalan Central Depression, gathering the waters of the Serra de Brufaganya and Serra de Queralt mountain ranges. It flows through deep gorges across the Catalan Pre-Coastal Range and then close to Santes Creus and, at the end, into the Mediterranean at the Tamarit Castle, Tarragonès, near Altafulla forming a coastal lagoon separated from the sea by a sandbar. The river mouth is a protected area.[1]
Its main tributaries are:[2]