Waldemar

Waldemar or Valdemar may refer to:

Royalty

Valdemar I of Denmark or Waldemar the Great (1131–1182)
Valdemar II of Denmark or Waldemar the Victorious (1170–1241)
Valdemar the Young (1209–1231)
Valdemar III of Denmark (1314–1364)
Waldemar I, Prince of Anhalt-Zerbst (d. 1368)
Waldemar II, Prince of Anhalt-Zerbst (d. 1371)
Valdemar IV of Denmark or Waldemar Otherday (c. 1320–1375)
Waldemar III, Prince of Anhalt-Zerbst (d. 1391)
Valdemar of Sweden (1239–1302)
Valdemar of Denmark (bishop) (1157/1158-1235 or 1236)
Prince Valdemar of Denmark (1858–1939)
Waldemar, Margrave of Brandenburg-Stendal or Waldemar the Great (c. 1280–1319)
Prince Waldemar of Prussia (1817-1849), son of Prince William
Prince Waldemar of Prussia (1868-1879), son of Emperor Frederick III
Prince Waldemar of Prussia (1889-1945), son of Prince Henry
Woldemar, Prince of Lippe (1824–1895)

The fictional country of Valdemar in the world of Velgarth, the setting for a number of fantasy books and stories by Mercedes Lackey
The pseudonym of Vladimir Ivanov in the band Demenzia
M. Valdemar of Edgar Allan Poe's short story "The Facts in the Case of M. Valdemar"