Heilig Hüsli (Holy house) is a bridge chapel in Rapperswil, Canton of St. Gallen , Switzerland.

The chapel is located next to the Seedamm, near the Rapperswil railway station. It is situated on a small island on upper Lake Zürich (Obersee) off of the Holzbrücke Rapperswil-Hurden , a historical wooden bridge that was reconstructed in 2001.

During formation of the Alps, layers of sediment were deposited by ancient bodies of water. This gave rise to the banded rocks that form the Lindenhof hill in Rapperswil, and the islands of Ufnau, Lützelau and Heilighüsli.