Princess Mary Adelaide of Cambridge (Mary Adelaide Wilhelmina Elizabeth; 27 November 1833 – 27 October 1897) was a member of the British Royal Family, a granddaughter of George III and great-grandmother of Elizabeth II. She held the title of Duchess of Teck through marriage.

Mary Adelaide is remembered as the mother of Queen Mary, the wife of King George V. She was one of the first royals to patronise a wide range of charities.

Mary Adelaide was born on 27 November 1833 in Hanover, Germany. Her father was Prince Adolphus, Duke of Cambridge, the youngest surviving son of George III and Charlotte of Mecklenburg-Strelitz. Her mother was Princess Augusta of Hesse-Cassel, the daughter of Prince Frederick of Hesse-Cassel.

The young princess was christened on 9 January 1834 at Cambridge House, Hanover by Rev John Ryle Wood, Chaplain to the Duke of Cambridge. Her godmother and paternal aunt Princess Elizabeth was the only godparent who was present. The rest (who were absent, possibly represented by proxies) were King William IV and Queen Adelaide (her paternal uncle and aunt), Princess Mary (her paternal aunt), Princess Marie of Hesse-Cassel (her maternal aunt) and Princess Marie Louise Charlotte of Hesse-Kassel (her first cousin). She was named Mary Adelaide Wilhelmina Elizabeth for her aunts and uncle.

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