| Official Name: | Koštabona |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Slovenia |
| Coordinates: | 45.4796°N 13.7367°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: | 3.52 |
| Elevation M: | 252.5 |
| Population Total: | 205 |
| Population As Of: | 2002 |
| Footnotes: | [1] |
Koštabona (pronounced as /sl/; Italian: Costabona[2]) is a village in the City Municipality of Koper in the Littoral region of Slovenia.
Koštabona was attested in written sources in 1620 as Costabuona, and in 1763–87 as Costabona. The Slovene name Koštabona is borrowed from Italian. The name is a compound of costa 'slope' and bona 'good, fertile', referring to its physical location on a fertile promontory.[3]
Another theory, based on oral tradition,[4] claims that in Late Antiquity Koštabona was the site of a Roman fortress named Castrum Bonae guarding the trade route through the Dragonja Valley, and that the name is derived from this.[4] [5] However, Italian has no co- reflex derived from this noun (cf. Italian castellum 'castle'),[6] and the expected Italian reflex of Latin castrum would be **castro, not costa (cf. Latin astrum > Italian astro 'star', Latin rastrum > Italian rastro 'rake', etc.).
Koštabona stands on a hill above the Dragonja River. Archaeological evidence shows that the site was inhabited in prehistoric times.[5]
The parish church in the settlement is dedicated to Saints Cosmas and Damian.[7] There is also a small church dedicated to the Blessed Deacon Elias (said to be a disciple of Saint Hermagoras) and a cemetery church dedicated to Saint Andrew.