'Jolka' was a German unrealised plan for the invasion and capture of neutral Switzerland in the face of Swiss resistance (mid-1940).

The plan was prepared in outline by the headquarters of Generalfeldmarschall Wilhelm Ritter von Leeb’s Heeresgruppe 'C', based at Dijon in occupied France, on the instructions of Generaloberst Franz Halder, the chief of the Oberkommando des Heeres general staff, after the fall of France.