| Type: | municipality |
| Official Name: | Gelsa |
| Subdivision Type2: | Province |
| Subdivision Name2: | Zaragoza |
| Area Total Km2: | 72 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Pushpin Map: | Spain Aragon#Spain#Europe |
| Coordinates: | 41.4°N -27°W |
Gelsa is a municipality located in the province of Zaragoza, comarca (county) of Ribera Baja del Ebro, Aragon, Spain. According to the 2004 census (INE), the municipality has a population of 1,216 inhabitants.