Princess Marie Louise of Hanover and Cumberland (11 October 1879 – 31 January 1948) was the eldest child of Ernest Augustus, Crown Prince of Hanover, and Princess Thyra of Denmark, the youngest daughter of Christian IX of Denmark and Louise of Hesse-Kassel.

Through her father, Marie Louise was a great-great-granddaughter of George III of the United Kingdom and Charlotte of Mecklenburg-Strelitz.

She was a first cousin of Nicholas II of Russia, Constantine I of Greece, Christian X of Denmark, Haakon VII of Norway and Queen Maud of Norway and George V of the United Kingdom.

Marie Louise married Prince Maximilian of Baden (1867–1929), her third cousin twice removed, on 10 July 1900 in Gmunden, Austria-Hungary.

[1] He was the son of Prince Wilhelm of Baden and Princess Maria Maximilianovna of Leuchtenberg and became a first cousin twice removed of Napoleon III of France.