| Official Name: | Trnjaci |
| Settlement Type: | Village (Selo) |
| Pushpin Map: | Bosnia and Herzegovina |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  Bosnia and Herzegovina |
| Subdivision Type1: | Municipality |
| Unit Pref: | Imperial |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 44.8319°N 19.2922°W |
Trnjaci is a village in the municipality of Bijeljina, Bosnia and Herzegovina. [1]