Slatnik () is a mountain in northwestern Slovenia. It stands southwest of the Sorica Plateau.
The name Slatnik appears in Slovenia as both an oronym and a settlement name (e.g., Slatnik, Veliki Slatnik, etc.). Like related names (e.g., Slatenik), it is derived from the common noun slatina 'spring with salty or acidic water', referring to a local geographical feature.