| Official Name: | Spodnji Polšnik |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Lower Carniola |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Central Sava |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Litija |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.0717°N 14.9606°W |
| Elevation M: | 614 |
Spodnji Polšnik (pronounced as /sl/, de|Unterbillichberg[1]) is a former settlement in the Municipality of Litija in central Slovenia. It is now part of the village of Polšnik.[2] The area is part of the traditional region of Lower Carniola and is now included with the rest of the municipality in the Central Sava Statistical Region.[3]
Spodnji Polšnik stands in the northeastern part of Polšnik, on the road to Tepe.
Spodnji Polšnik had a population of 133 living in 24 houses in 1900.[1] Together with neighboring Zgornji Polšnik, Spodnji Polšnik was merged into the new combined settlement of Polsnik in 1953, ending its existence as a separate settlement.[4]