| Official Name: | Črni Kal |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Slovenia |
| Coordinates: | 45.55°N 13.8784°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Littoral |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Coastal–Karst |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Koper |
| Area Total Km2: | 1.47 |
| Elevation M: | 252.9 |
| Population Total: | 191 |
| Population As Of: | 2002 |
| Footnotes: | [1] |
Črni Kal (pronounced as /sl/; Italian: San Sergio) is a village in southwestern Slovenia in the City Municipality of Koper.[2] It is best known today for the Črni Kal Viaduct, the longest and the highest viaduct in Slovenia.
The name Črni Kal literally means 'black pond', based on the common noun kal 'pond, watering hole' and referring to a local geographical feature.[3]
The village has some good examples of traditional Karst architecture. One such monument is the Benko House, built in 1489 by stonemasons Andrej (Andrew) and Benko (Benjamin) as indicated by an inscription on the building: Andreas et Benco construxerunt. This makes it oldest surviving farmhouse in the Koper area and is also the oldest signed and dated secular building in all of Slovenia. It stands on the lower edge of the village core and is made of chiseled limestone and marlstone blocks. It comprises two buildings with inscriptions in the Glagolitic alphabet on the facade. The older building is the main house, with Romanesque as well as late-Gothic features.[4]
The local church is dedicated to Saint Lawrence and belongs to the Parish of Predloka.[5] The church's bell tower leans to the west, deviating from the vertical by more than a meter.[6]