Marie Carola Franciska Roselyne Galway, Lady Galway, CBE, DStJ (5 January 1876 – 29 June 1963), née Blennerhassett, was a British charity and civic worker and advocate for women's rights. She was married to Sir Henry Galway, Governor of South Australia.
She was born at Mayfair, London, the only daughter of two leaders of the English Liberal Catholic Movement, Sir Rowland Blennerhassett, Irish baronet and parliamentarian, and his wife, Countess Charlotte Julia de Leyden, a biographer and historian from Bavaria, whom he had met when attending the First Vatican Council The future Lady Galway attended private schools in Germany, France and Switzerland and read extensively in six languages.
Shortly after her marriage to Sir Henry Galway in 1914, she accompanied her husband to Adelaide on his appointment as Governor of South Australia. His term there (from 1914 to 1920) was controversial, including his stirring up war-time negative feeling against Australians of German descent, despite the fact that his wife was half-German. Lady Galway was active in civic affairs generally, but particularly in the advancement of women's rights in Britain.
In August 1914, at the request of Lady Helen Munro Ferguson, the wife of the governor-general, Lady Galway founded the South Australian division of the British Red Cross Society. The South Australian division was originally housed in the Government House Ballroom on North Terrace, where volunteers sorted and packed items for members of the Australian Defence personnel serving overseas. The Lady Galway Convalescent Home, also known as the Lady Galway clubhouse for soldiers, was opened in 1916 at Henley Beach. The convalescent home was under the management of the army and navy department of the Y.M.C.A. until September 1919, when it was officially handed over to the Governor of South Australia, Sir Henry Galway. The wife of the governor, or if the governor is female, the governor herself, has since been the president of the Red Cross in South Australia.