| Slavnica | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Name: | Slovakia |
| Subdivision Type2: | Region |
| Subdivision Name2: | Trenčín |
| Subdivision Type3: | District |
| Subdivision Name3: | Ilava |
| Pushpin Map: | Slovakia Trenčín Region#Slovakia |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location of Slavnica in the Trenčín Region |
| Coordinates: | 49°N 29°W |
| Established Title: | First mentioned |
| Established Date: | 1379 |
| Area Footnotes: | [1] |
| Area Total Km2: | 7.81 |
| Elevation M: | 295[2] |
| Elevation Ft: | 968 |
| Population As Of: | 2022-12-31 |
| Population Footnotes: | [3] |
| Population Total: | 854 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 018 54 |
| Area Code: | +421 42 |
| Blank Name: | Car plate |
| Blank Info: | IL |
| Website: | www.slavnica.sk |
| Area Note: | 2022-06-31/2022-07-01 |
Slavnica (Hungarian: Szalonca) is a village and municipality in Ilava District in the Trenčín Region of north-western Slovakia.
In historical records the village was first mentioned in 1379.
The municipality lies at an altitude of 236 metres and covers an area of 7.810 km2. It has a population of about 820 people.