Werdenberg may refer to:
Places 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
People (c. 1440 – c. 1474) (de) Anna von Werdenberg (died 1554), grandmother of Gebhard Truchsess von Waldburg (c. 1480 – 1530), Knight of the Golden Fleece George III of Werdenberg-Sargans, married to Katharina, daughter of Charles I, Margrave of Baden-Baden (? – c. 1271), also Count of Kraiburg and Marquartstein (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 (c. 1416 – 1465), married to the daughter of Eberhard III, Count of Württemberg
Fictional people Princess Marie Thérèse von Werdenberg (The Marschallin), in Richard Strauss' opera Der Rosenkavalier