Unspunnenfest is a festival held in the town of Interlaken, Switzerland, near the old ruin of Unspunnen Castle, in the Bernese Alps, approximately once every twelve years, most recently in 2017. The festival highlights traditional Swiss culture and features competitions of Steinstossen, Schwingen (wrestling) and yodeling. The stone-throwing competition uses an 83.5 kg (184.1 lb) stone known as the Unspunnenstein, made of Aare granite from the Hasli valley.

Interlaken is a Swiss town and municipality in the Interlaken-Oberhasli administrative district in the canton of Bern. It is an important and well-known tourist destination in the Bernese Oberland region of the Swiss Alps, and the main transport gateway to the mountains and lakes of that region.