| Official Name: | Donja Trnica |
| Settlement Type: | Village |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  Serbia |
| Subdivision Type1: | District |
| Subdivision Name1: | Pčinja District |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Trgovište |
| Unit Pref: | Imperial |
| Population As Of: | 2002 |
| Population Total: | 213 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
Donja Trnica is a village in the municipality of Trgovište, in southeastern Serbia. According to the 2002 census, the village has a population of 213 people.[1]