| Official Name: | Kostrivnica |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Styria |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Savinja |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Šentjur |
| Area Total Km2: | 3.78 |
| Population Total: | 196 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] [2] |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.1541°N 15.373°W |
| Elevation M: | 335 |
| Footnotes: | [3] |
Kostrivnica (in Slovenian pronounced as /kɔˈstɾiːu̯nitsa/) is a dispersed settlement in the Municipality of Šentjur, in eastern Slovenia. It lies in the northern part of the Sava Hills (Slovenian: Posavsko hribovje) north of Planina. The settlement, and the entire municipality, are included in the Savinja Statistical Region, which is in the Slovenian portion of the historical Duchy of Styria.[4]