Alexander Konrad Friedrich Heinrich Prince zu Sayn-Wittgenstein-Sayn[1][2] (born 22 November 1943), is a German businessman, who is head of the Princely House Sayn-Wittgenstein-Sayn.

He was born in Salzburg as the first son of Ludwig, 6th Prince zu Sayn-Wittgenstein-Sayn (1915–1962) and his wife Baroness Marianne von Mayr-Melnhof (born 1919).

[1] Alexander is a descendant of James II of England and his illegitimate son James Fitzjames, 1st Duke of Berwick, through his paternal great-grandmother Marie Auguste Yvonne de Blacas d'Aulps (1851-1881), daughter of Louis, Duke of Blacas.

From 1986 to 2013, he served as president of the German Castles Association,[1] which elected him on 28 April 2013 honorary president as well as president of the "Stiftung der Deutschen Burgenvereinigung" (Foundation of the German Castles Association).

In 1969, Alexander married Countess Gabriela von Schönborn-Wiesentheid (b.