Valdemar den Unge
- Født: Omkr 1209
- Død: 28 Nov. 1231 i en alder af ca. 22 år
 Notater:
Valdemar the Young (Danish: Valdemar den Unge) (c.?1209 - 28 November 1231) was King of Denmark from 1218 until his death.
Valdemar was the eldest son and co-ruler of Valdemar II of Denmark by his first wife, Dagmar of Bohemia. He did not outlive his father so was never a sole monarch. He is sometimes referred to as Valdemar III for example his tombstone reads in Latin: Waldemarus Tertius Rex Daniae, Filius Waldemari Secundi "Valdemar the Third, King of Denmark, son of Valdemar the Second". Although Valdemar III is more commonly used to denote a later king, Valdemar of Schleswig
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