Alexander, Duke of Schleswig-Holstein-Sonderburg, (20 January 1573 – 13 May 1627) was a Danish nobleman.

[1] Alexander was born in Sønderborg (German: Sonderburg) in Schleswig, the third son of John II, Duke of Schleswig-Holstein-Sonderburg and Elisabeth of Brunswick-Grubenhagen.

Because his elder surviving brother chose Ærø as his seat, Alexander received Sønderborg upon their father's death and was in practice its second duke.

Alexander married Dorothea of Schwarzburg-Sondershausen,[citation needed] daughter of John Günther I, Count of Schwarzburg-Sondershausen, on 26 November 1604 in Oldenburg.

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