Gaj (Гај) 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 and its population numbering 3,302 people (2002 census).
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| Year | Total | Serbs | Czechs | Hungarians | Roma | Yugoslavs | Romanians | Macedonians | Rest |
| 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% |