Frohberg Castle (German: Ruine Frohberg, Tschäpperli or Tschöpperli) is a medieval castle ruin in the Swiss municipality of Aesch in the canton of canton of Basel-Land.
The ruin is on a rocky ridge at the upper end of the Klus valley on the way to the old Platten pass road. It lies near the ruins of Schalberg Castle, the ruins of Engenstein Castle and the ruins of Münchberg Castle. It is the rearmost castle in the Aesch controlled Klus valley and is one of the castles built on the ridge above Aesch.
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