Christian (10 April 1603 – 2 June 1647) was Prince-Elect of Denmark from 1610 and Heir Apparent to the Throne of the Kingdom of Norway from 1603.

Christian was their second son and the oldest one living, as his elder brother Frederik had died in 1599, less than a year old.

In 1608, the Council and representatives of the Estates supported the King in naming Christian as heir apparent.

[1] Titled Tugtmester, Niels Jørgensen Æryleus (1610–1617) and Jesper Brochmand (1617–1620) were responsible for educating the Prince.

In 1633, Christian was engaged to Magdalene Sibylle, daughter of Elector John George I of Saxony; the marriage had been discussed as early as 1630.

Christian was not much involved on the political scene in this phase of his life, partly to his own dismay, but he did act as head of government in 1644, when the King was absent due to the Torstenson War.

[4] He was heavily indebted; despite his father's attempts to pay some of Christian's debts, he still owed more than 215,000 rigsdaler in 1647.