Ammersee-Gymnasium, Secondary school building in Dießen am Ammersee, Germany

Ammersee-Gymnasium is a secondary school at the northern edge of Dießen am Ammersee, built from 2005 to designs by Munich firm Fritsch & Tschaidse. Its layout follows a "Steg" (landing stage) concept: a long two-storey classroom block closes off the village edge, while side wings for specialist subjects interlock with the landscape. Widened sections form an entrance deck before the sports hall and a viewing deck toward the lake housing the library and student work area, so the buildings read as ships moored at a jetty.

In 1990 the Landsberg district began debating a second Gymnasium; the Bavarian ministry approved the Ammersee west-shore site on 27 February 2002, and the district council chose St. Alban in Dießen that July. Klaus Rechenberger was named founding head in October 2005, and teaching started in 2006/07 with 420 pupils in 15 classes and 34 teachers. The ministry granted the name Ammersee-Gymnasium Dießen on 1 May 2007.

The school was named Ammersee-Gymnasium Dießen by the Bavarian ministry on 1 May 2007, a year after teaching began. Its rowing programme is run with the Ammersee-Ruderer club, and every sixth-grade pupil learns to row; the school competes at Bavarian school championships and German ergometer championships.

The school sits on Dießen's northern edge by the Ammersee, with its own St. Alban stop on the Ammerseebahn line. An underpass links the grounds to the lakeshore and lets cyclists arrive from the Seeuferstraße; a bus loop connects to the Staatsstraße 2055, and a cycle path runs from Dießen parallel to the road. The boat house and swimming dock are reached from the water side.

The architecture follows an unusual concept inspired by boat landing docks, combining white metal panels with glass elements. This design creates a visual connection between the school building and its waterfront setting.