The Balm ruins (German: Ruine Balm or Ruine Balmfluh) are the remains of a fortified cave dwelling at the foot of Balmfluh (alternative spelling: Balmflue) in the Jura Mountains, in the municipality of Balm bei Günsberg in the Canton of Solothurn.

The 2.4-metre (8 ft) thick outer wall was provided with two doorways and some narrow windows.

The wet rock face was covered with a lining wall; and the rest was a simple two-story timber construction, which is shown evident by the presence of holes into which beams were inserted.

While being restored, the presently visible wall openings were distorted from their original form.

The present-day rise is of modern source, and only partly represents its original state.