| Official Name: | Ustje |
| 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: | Inner Carniola |
| Subdivision Type2: | Statistical region |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Ajdovščina |
| Area Total Km2: | 2.77 |
| Population As Of: | 2020 |
| Population Total: | 344 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 45.8702°N 13.8951°W |
| Elevation M: | 101.9 |
| Footnotes: | [1] |
Ustje (in Slovenian pronounced as /ˈuːstjɛ/) is a village in the Vipava Valley south of Ajdovščina in the traditional Inner Carniola region of Slovenia.[2] It is now generally regarded as part of the Slovenian Littoral.
The name Ustje is derived from the common noun ustje 'river mouth', referring to the location where Jovšček Creek joins the Vipava River.[3] Some sources also claim that the name may originate from Saint Justus, to whom the parish church in the settlement was dedicated in 1766;[4] however, this is linguistically unlikely.[3] Compare also Ustje in the Municipality of Ig.
The oldest monument in the village is the 17th-century church, built on a small hill dedicated to John the Evangelist.[5] Ruins of walls indicate that the site must have been used as a fortification during Ottoman raids.
On August 8, 1942, Italian soldiers of the Julia division killed eight people and burned down the village. After the war, the village was rebuilt and August 8 is observed as a memorial day. The events from 1942 are described in Danilo Lokar's book Sodni dan na vasi (Doomsday in the Village).
Ustje is the site of a mass grave associated with the Second World War. The Ajdov Field Mass Grave (Slovenian: Grobišče Ajdovsko polje) is located in a meadow and a field 110 m south of a waste treatment facility, between a field road and Hubelj Creek. In March 2002, investigators disinterred 67 skeletons from the site, identified as the remains of 15 German and 52 Italian soldiers.[6]
The parish church in Ustje is dedicated to Saint Justus. It received its present appearance in 1766, at which time it was also dedicated to the saint. The church has an octagonal chancel walled on five sides, a rectangular nave, and a belltower. Its furnishings are in the Baroque style.[7]