Marie Carola Franciska Roselyne, Lady Galway CBE DStJ (née Blennerhassett; 5 January 1876 – 29 June 1963), was a British charity and civic worker and advocate for women's rights.

Galway 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.

They had a daughter and a son before he died in 1897 and she returned to England, where she worked for the sick and destitute, and helped to found a committee to advise on legislation affecting women and children.

[2] 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.