Princess Sophie Caroline Marie Wilhelmine of Luxembourg (14 February 1902 – 24 May 1941) was the sixth and youngest daughter of Grand Duke William IV and his wife, Infanta Marie Anne of Portugal.

Sophie was born in Berg Castle, Colmar-Berg, Luxembourg. Two of Sophie's elder sisters reigned as Grand Duchess of Luxembourg: Marie-Adélaïde and Charlotte.

Sophie married Prince Ernst Heinrich of Saxony, youngest son of the last Saxon monarch Frederick Augustus III and his wife Archduchess Luise of Austria, Princess of Tuscany, on 12 April 1921 at Schloss Hohenburg. Sophie and Ernst Heinrich had three sons, three grandchildren, nine great-grandchildren and eight great-great-grandchildren:

Sophie died on 24 May 1941 at age 39 in Munich of pneumonia. Following her death, Ernst Heinrich married secondly and morganatically to Virginia Dulon on 28 June 1947 in Paris.

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