Princess Marie of Windisch-Graetz

Princess Marie
Duchess Marie of Mecklenburg
Duchess Marie of Mecklenburg, née Princess of Windisch-Graetz
Born	1856
Died	1929 (aged 72–73)
Spouse	Duke Paul Frederick of Mecklenburg
Issue	Duke Paul Friedrich of Mecklenburg Duchess Marie Louise of Mecklenburg Duchess Marie Antoinette of Mecklenburg Duke Henry Borwin of Mecklenburg Duke Joseph of Mecklenburg
House	House of Windisch-Graetz (by birth) House of Mecklenburg-Schwerin (by marriage)
Father	Hugo, Prince of Windisch-Grätz
Mother	Princess Louise of Mecklenburg-Schwerin
Religion	Roman Catholicism

Princess Marie of Windisch-Graetz (1856–1929) was a daughter of Hugo, Prince of Windisch-Grätz, and Princess Louise of Mecklenburg-Schwerin (herself the eldest daughter of Grand Duke Paul Frederick and Princess Alexandrine of Prussia).

In Schwerin on 5 May 1881, Princess Marie married her first cousin, the German-born Duke Paul Frederick of Mecklenburg, second son of Frederick Francis II, Grand Duke of Mecklenburg, and his wife, Princess Augusta Reuss of Köstritz. The couple had three surviving children, all of whom were raised as Roman Catholics, Marie's religion, and lived a quiet life in Venice, where they befriended Cardinal Sarto (later Pope Pius X), who often visited the family and acted as their spiritual advisor.

On 21 April 1884 Duke Paul Frederick deferred his and his sons' rights of succession to Mecklenburg-Schwerin in favour of his younger brothers and their sons, so they would take precedence over him and his. In 1887 her husband, raised a Lutheran, converted to Roman Catholicism, the religion of his wife and their common children.

Marie née Windisch-Graetz surveyed several archaeological excavations in Austria and Carniola, including excavations at Hallstatt Archaeological Site in Vače. Some of the artifacts were sold to museums in Harvard, Oxford and Berlin by her daughter Duchess Marie Antoinette of Mecklenburg.