Mary Catherine Guinness Ferguson (1823–1905) was an author and biographer in Dublin, Ireland.
She was born at Stillorgan, co. Dublin, on 13 September 1823,[1] to Robert Rundell Guinness (1789-1857) and his first wife Mary Anne Seymour (died 1837).
Their circle of acquaintances included George Petrie and William Reeves.
[2] She died in Dublin on 5 March 1905, and was buried in her husband's grave at Donegore, co. Antrim.
[2] Irish scholars, writers and artists often net at Ferguson's home.