| Gelgia | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Switzerland |
| Mouth: | Albula |
Gelgia (Romansh, German: Julia) is a river in the Grisons canton, eastern Switzerland. It is a tributary of the Albula, which it meets in Tiefencastel. The road to the Julier Pass runs through the Sursés (German: Oberhalbstein), like the major valley of the Gelgia and its side valleys are called.