Seealpsee is a lake in the Alpstein range of the canton of Appenzell Innerrhoden, Switzerland. At an elevation of 1,143.2 m, the surface area is . The lake can be reached by foot from Wasserauen or from Ebenalp. A network of routes around Ebenalp connects Seealpsee with other notable sights in the Appenzell Alps, such as the Wildkirchli and Säntis.