Prince Alexandre of Belgium (French: Alexandre Emmanuel Henri Albert Marie Léopold, Dutch: Alexander Emanuel Hendrik Albert Maria Leopold; 18 July 1942 – 29 November 2009) was the eldest child from the second marriage of King Leopold III of Belgium. His mother was Lilian, Princess of Réthy. The late King Baudouin of Belgium, and former King Albert II of Belgium, were his two older half-brothers. Grand Duchess Joséphine-Charlotte of Luxembourg was his older half-sister.

Prince Alexandre was born in Laeken in Brussels. He had two younger full sisters: Marie-Christine and Marie-Esmeralda. His godmother was his elder half-sister, Princess Joséphine-Charlotte of Belgium.

Held under house arrest by the Germans until 1944, upon the invasion in Normandy, Léopold, his second wife, and his four children were transferred to Germany and Austria where they remained under house arrest, first in a fort at Hirschstein in Saxony during the winter of 1944–45, and then at Strobl, near Salzburg. They were freed by the U.S. Army in May 1945. After the war, the Royal Family was unable to return to Belgium and was forced to spend some years in Swiss exile before finally being able to return to Belgium in 1950 after a national referendum. Alexandre studied medicine for a while, later pursuing a career in trade.

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