Kempraten-Lenggis is a village (Kirchdorf) within the municipality of Rapperswil-Jona, Wahlkreis (constituency) of See-Gaster in the Canton of St. Gallen in Switzerland. The remains of the Gallo-Roman settlement Centum Prata are one of the most important archaeological sites in the canton of St. Gallen; Centrum Prata is located at the so-called Kempratnerbucht, in Rapperswil and Busskirch on Zürichsee lake shore.

Kempraten-Lenggis was a village of the former independent municipality of Jona that in 2006 merged with Rapperswil to the town of Rapperswil-Jona. It is located on the right-hand (northeastern) shore of Lake Zurich (German: Zürichsee) northerly of Rapperswil on the so-called Kempratnerbucht, literally "Bay of Kempraten".