| Gaj | |
| Native Name: | Гај |
| Pushpin Map: | Serbia Vojvodina#Serbia#Europe |
| Pushpin Map Caption: | Location of Gaj within Serbia |
| Settlement Type: | Village (Selo) |
| Subdivision Type: | Country |
| Subdivision Name: | Serbia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Vojvodina |
| Subdivision Type2: | District |
| Subdivision Name2: | South Banat |
| Subdivision Type3: | Municipalities |
| Population As Of: | 2002 |
| Total Type: | Gaj |
| Population Total: | 3,302 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 44.7878°N 21.0581°W |
| Elevation M: | 64 |
| Postal Code Type: | Postal code |
| Postal Code: | 26223 |
| Area Code: | +381(0)13 |
| Blank Name: | Car plates |
| Blank Info: | KO |
Gaj is a village in Serbia. It is situated in the Kovin municipality, in the South Banat District, Vojvodina province. The village has a Serb ethnic majority (79.31%) and its population numbering 3,302 people (2002 census).
| Year | Total | Serbs | Czechs | Hungarians | Romani | Yugoslavs | Romanians | Macedonians | Other | |
| 1991 | 3,432 | 82.54% | 3.96% | 3.67% | 3.11% | 2.94% | 1.13% | 0.29% | 2.36% | |
| 2002 | 3,302 | 79.31% | 4.14% | 3.63% | 5.78% | 0.24% | 0.96% | 0.24% | 5.74% |