| Official Name: | Osilnica |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Lower Carniola |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Southeast Slovenia |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Osilnica |
| Area Total Km2: | 1.1 |
| Population As Of: | 2020 |
| Population Total: | 76 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 45.5289°N 14.6983°W |
| Elevation M: | 293.6 |
| Postal Code: | 1337 |
| Footnotes: | [1] |
Osilnica (in Slovenian pronounced as /ɔˈsiːu̯nitsa/, in older sources also Osivnica,[2] German: Ossiunitz[2] [3]) is a settlement in southern Slovenia. It is located on the left bank of the Kolpa River next to the border with Croatia. It is part of the traditional region of Lower Carniola and is now included in the Southeast Slovenia Statistical Region.[4] It is the largest settlement and the seat of the Municipality of Osilnica.
The Čabranka, a small river on the border between Slovenia and Croatia and a left tributary of the Kupa River, joins the Kupa at Osilnica.
Osilnica was attested in historical sources in 1365 as Ossiwniz (and as Ossawnitz in 1456–61 and Ossynnitz in 1498). The name may be derived from the adjective osiv 'grayish'. Derivation from *osьlьnica (< *osьlъ 'donkey' or *osьla 'whetstone') has also been proposed, but is less convincing for vocalic reasons.[5]
The Osilnica volunteer fire department became a founding unit of the Kočevje municipal fire department on 28 August 1955.[6]
The parish church in Osilnica is dedicated to Saints Peter and Paul and belongs to the Roman Catholic Diocese of Novo Mesto. It has a cruciform floor plan and was built in 1876 on the site of a 16th-century building.[7]
Notable people that were born or lived in Osilnica include: