Mary of Teck (Victoria Mary Augusta Louise Olga Pauline Claudine Agnes; 26 May 1867 – 24 March 1953) was the queen consort of the United Kingdom and the British Dominions, and Empress of India, as the wife of King-Emperor George V.

Although technically a princess of Teck, in the Kingdom of Württemberg, she was born and brought up in the United Kingdom. Her parents were Francis, Duke of Teck, who was of German extraction, and Princess Mary Adelaide of Cambridge, a member of the British Royal Family. To her family, she was informally known as "May", after her birth month. At the age of 24 she was betrothed to Prince Albert Victor, Duke of Clarence and Avondale, the eldest son of the Prince of Wales, but six weeks after the announcement of the engagement he died unexpectedly of pneumonia. The following year she became engaged to Albert Victor's next surviving brother, George, who subsequently became king. Before her husband's accession she was successively Duchess of York, Duchess of Cornwall and Princess of Wales. As his queen consort from 1910, she supported her husband through the First World War, his ill-health and major political changes arising from the aftermath of the war and the rise of socialism and nationalism. After George's death in 1936, her eldest son Edward became King-Emperor, but to her dismay he abdicated the same year in order to marry twice-divorced American socialite Mrs. Wallis Simpson. She supported her second son, Albert, who succeeded to the throne as George VI, until his death in 1952. She died the following year, at the beginning of the reign of her granddaughter, Elizabeth II. Briefly, there were three queens in the country: Mary; her daughter-in-law, Queen Elizabeth The Queen Mother; and Elizabeth II.

Teck was a ducal castle in the kingdom of Württemberg, immediately to the north of the Swabian Jura and south of the town of Kirchheim unter Teck (now in the district of Esslingen), taking its name from the ridge, 2544 feet high, which it crowned. It was destroyed in the German Peasants' War (1525). The castle was reconstructed during the 19th and 20th centuries.

In 1863, the title "Prince of Teck" (German: Fürst von Teck) was conferred as a courtesy title by King William I of Württemberg upon the children of his cousin Duke Alexander of Württemberg (1804–85) by his morganatic marriage with Claudine Rhédey von Kis-Rhéde (1812–41), ennobled as countess of Hohenstein. In 1871, Prince Francis, the eldest son of Duke Alexander, was created Duke of Teck. His eldest son Adolphus (born 1868) was the holder of the title in 1910.

The most famous of the Teck family is considered to be Duke Francis's daughter, Mary of Teck, Queen consort to George V of the United Kingdom and Empress of India.

Coordinates: 48°35′17″N 9°28′14″E / 48.58806°N 9.47056°E / 48.58806; 9.47056