| Official Name: | Spodnje Duplje |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Upper Carniola |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Upper Carniola |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Naklo |
| Population As Of: | 2002 |
| Population Total: | 694 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.2996°N 14.3019°W |
| Elevation M: | 444 |
| Footnotes: | [1] |
Spodnje Duplje (pronounced as /sl/ or pronounced as /sl/; German: Unterduplach[2]) is a settlement in the Municipality of Naklo in the Upper Carniola region of Slovenia.
Spodnje Duplje was attested in historical sources as Burla in 1209, Duplach between 1205 and 1208, niderm Devplach in 1348, and Tewͦpplach in 1348, among other spellings.[3]
The local church is dedicated to Saint Vitus.