| Official Name: | Šmartno |
| 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: | Slovenian Littoral |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Gorizia |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Brda |
| Area Total Km2: | 1.42 |
| Population As Of: | 2020 |
| Population Total: | 198 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.0057°N 13.5562°W |
| Elevation M: | 259.1 |
| Footnotes: | [1] |
Šmartno (pronounced as /sl/; it|San Martino del Collio or San Martino di Quisca) is a village in the Municipality of Brda in the Littoral region of Slovenia. The entire village has been declared a cultural heritage monument.[2]
The village is located in the geographical center of the Gorizia Hills, on a hill and surrounded by defensive walls. Its history dates back to Roman times, and the village was first mentioned as Sanctus Martinus in 1317.[3]
The parish church, from which the settlement also gets its name, is dedicated to Saint Martin and belongs to the Koper Diocese.[4]