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.