Kaiseregg, Mountain summit in Canton of Fribourg, Switzerland.

Kaiseregg is a 2,185-metre summit of the Fribourg Prealps, in the municipality of Plaffeien southeast of Schwarzsee. It is the second-highest peak of the northeasternmost group of these prealps, after the Schafberg (2,239 m). Its southwest ridge runs over the Kaisereggpass (2,072 m) toward the Schafberg, and its northeast ridge drops steeply toward the Stieregrat.

The sources record the historical name as Geisser-Egg; the form Kaiseregg is the one in use today. The mountain lies in the Fribourg Prealps above Schwarzsee, on the territory of Plaffeien, with the district boundary to Gruyère just west of the summit and the Bernese cantonal boundary just east. Its north-west flank has been developed for skiing since 1956, when the first ski lift was built; a second followed seven years later, and in summer 2011 both were replaced by a detachable four-seat chairlift.

Local herders use these slopes to graze cattle throughout the summer season. The presence of animals and the sound of bells are part of what makes this mountain feel alive and connected to alpine farming traditions.

The hiking route from Schwarzsee is well-marked and takes most visitors several hours to complete on foot. Using the chairlift at Riggisalp can reduce hiking time significantly, though weather conditions in the mountains can change quickly at any time of year.

The first ski lift up the Kaiseregg was built in 1956; a second followed seven years later. In summer 2011 both were replaced by a detachable four-seat chairlift, part of the Kaisereggbahnen serving the mountain's northwest flank.