Säntis (2,502 m) is a mountain in the Alpstein sub-range of the Appenzell Alps in Switzerland. It can be reached by aerial tramway from Schwägalp.
The peak is the highest point of the cantons of Appenzell Innerrhoden and Appenzell Ausserrhoden, and is also shared by the Canton of St. Gallen.
From the Swisscom transmission tower (123.55 m), various VHF radio and television programs (SF1, SF2) of SRG SSR idée suisse are broadcast.
Säntis was also the name of a canton of the Helvetic Republic; see Canton of Säntis.