Adelaide of Saxe-Meiningen was Queen of the United Kingdom of Great Britain and Ireland and Queen of Hanover from 26 June 1830 to 20 June 1837 as the wife of King William IV. Adelaide was the daughter of George I, Duke of Saxe-Meiningen, and Luise Eleonore of Hohenlohe-Langenburg. Adelaide, the capital city of South Australia, is named after her.

William IV was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 26 June 1830 until his death in 1837. The third son of George III, William succeeded his elder brother George IV, becoming the last king and penultimate monarch of Britain's House of Hanover.