| Official Name: | Gačnik |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | bottom |
| 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: | Drava |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Pesnica |
| Area Total Km2: | 4.79 |
| Population As Of: | 2002 |
| Population Total: | 492 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.6303°N 15.6808°W |
| Elevation M: | 301.9 |
| Footnotes: | [1] |
Gačnik (pronounced as /sl/) is a settlement in the Municipality of Pesnica in northeastern Slovenia. It lies in the western part of the Slovene Hills (sl|Slovenske gorice) in the valley of Gačnik Creek (sl|Gačniški potok), a minor tributary of the Pesnica River. The area is part of the traditional region of Styria. It is now included in the Drava Statistical Region.[2]
A small roadside chapel-shrine in the settlement dates to 1803.[3]