| Gauja | |
| Source1 Location: | Iwye district |
| Mouth: | Neman |
| Mouth Coordinates: | 53.8312°N 25.5936°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Lithuania, Belarus |
| Length Km: | 94 |
| Basin Size Km2: | 1677 |
The Gauja (in Lithuanian; be|Гаўя, Hawya; ru|Гавья, Gav’ya) is a river in southern Lithuania and western Belarus. The 94-kilometer long Gauja drains a 1,677 km2 (647 sq mi) basin. It is a right tributary of the Neman.