Werdenberg may refer to :

• Werdenberg, Switzerland, a town in the municipality of Grabs, St. Gallen, Switzerland
  • Werdenberg (Holy Roman Empire), a state of the Holy Roman Empire, c. 1230–1517
  • Werdenberg District, a former district
  • Werdenberg (Wahlkreis), a constituency
  • Werdenberg Castle, a castle in the town of Werdenberg

• Agnes von Werdenberg-Trochtelfingen [ de] (c. 1440 – c. 1474) (de)
• Anna von Werdenberg (died 1554), grandmother of Gebhard Truchsess von Waldburg
• Felix von Werdenberg [ de] (c. 1480 – 1530), Knight of the Golden Fleece
• George III of Werdenberg-Sargans, married to Katharina, daughter of Charles I, Margrave of Baden-Baden
• Hartmann I. von Werdenberg [ de] (? – c. 1271), also Count of Kraiburg and Marquartstein
• Hartmann von Werdenberg-Sargans [ de] (c. 1350–1416), Bishop of Chur
• Hartmann III, Count of Werdenberg-Sargans (died 1354), ruler of the County of Sargans in around 1337, see List of state leaders in 1337
• Johann II of Werdenberg (c.1430–1486), Bishop of Augsburg
• Johann III. (Werdenberg) [ de] (c. 1416 – 1465), married to the daughter of Eberhard III, Count of Württemberg

• Princess Marie Thérèse von Werdenberg ( The Marschallin), in Richard Strauss' opera Der Rosenkavalier

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