Princess Mary may refer to:
People
Mary of York (1467–1482), daughter of Edward IV of England
Mary Tudor, Queen of France (1496–1533), daughter of Henry VII of England
Mary of Woodstock 14th century English Princess and Nun
Queen Mary I of England (1516–1558), known as "Princess Mary" before her accession
Princess Mary of England (1605–1607), daughter of James VI and I
Mary, Princess Royal and Princess of Orange (1631–1660), daughter of Charles I of England
Queen Mary II of England (1662–1694), daughter of James VII and II, queen of Scotland & Ireland, wife of King William III, of the House of Orange, and joint ruler with him
Princess Mary of Great Britain (1723–1772), daughter of George II of Great Britain
Princess Mary, Duchess of Gloucester and Edinburgh (1776–1857), daughter of George III of the United Kingdom
Princess Mary Adelaide of Cambridge (1833–1897), granddaughter of George III of the United Kingdom
Princess Mary of Teck (1867–1953), great-granddaughter of George III of the United Kingdom, Queen consort of George V
Mary, Princess Royal and Countess of Harewood (1897–1965), daughter of George V of the United Kingdom
Queen Mary of Denmark (born 1972), Australian-born wife of Frederik X, King of Denmark
Ships
HMS Princess Mary, ships of the Royal Navy
SS Princess Mary, a Canadian Pacific British Columbia coast ferry
Princess Mary (1796 ship), an East India Company "extra ship", later a West Indiaman
Other
Princess Mary (film), a 1955 Soviet comedy film
Princess Mary High School, a former school in Halifax, Yorkshire, England
Princess Mary Lake, in Nunavut, Canada
Princess Mary Christmas gift box, distributed in World War I
Princess Mary's Gift Book, a World War I relief book illustrated by Edmund Dulac