| Official Name: | Tratna ob Voglajni |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Styria |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Savinja |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Šentjur |
| Area Total Km2: | 1.66 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] [2] |
| Population Total: | 17 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.1923°N 15.4487°W |
| Elevation M: | 331.5 |
| Footnotes: | [3] |
Tratna ob Voglajni (in Slovenian pronounced as /ˈtɾaːtna ɔp ʋɔˈɡlaːi̯ni/) is a small settlement in the Municipality of Šentjur, eastern Slovenia. Tratna ob Voglajni lies on the northern shore of Lake Slivnica, east of Gorica pri Slivnici. The settlement, and the entire municipality, are included in the Savinja Statistical Region, which is in the Slovenian portion of the historical Duchy of Styria.[4]
The name of the settlement was changed from Tratna to Tratna ob Voglajni in 1953.[5]