Schloss Windegg, Castle in Niederzell, Reichenau, Germany

Schloss Windegg is a three-storey rectangular building with stepped gables at the northwestern tip of Reichenau island. It measures 21.88 m by 12.80 m and was rebuilt in 1667 in the Late Renaissance style, replacing a 14th-century castle. The former chapel with cross-ribbed vault now serves as a dining room.

The castle was built in the 14th century as a residence for Reichenau's ministerial officials. A major Renaissance renovation in 1667 gave the building its current appearance.

Locals call the castle "'s Bürgle", also "Birgle" or "Bürglin". The former chapel with its cross-ribbed vault now serves as a dining room, and the old library on the first floor is a lounge with a large tiled stove. On the second floor, the Papstzimmer recalls Pope Martin V, who is said to have stayed here briefly in 1417 after his election at the Council of Constance.

The castle is now operated by an energy company and serves as a conference hotel and leisure facility. The public does not have access to the interior or grounds.

The name Windegg refers to the castle's exposed location at the northwestern tip of Reichenau island. Wind is a constant presence in this location.