Kathleen Eileen Moray Gray (9 August 1878 – 31 October 1976) was an Irish architect and furniture designer and a pioneer of the Modern Movement in architecture.
Gray was born as Katherine Eileen Moray Smith on 9 August 1878, near Enniscorthy, a market town in County Wexford south-eastern Ireland. Her father, James McLaren Smith, was a painter who encouraged his daughter's artistic interests. Her mother was Eveleen Pounden, a granddaughter of Francis Stuart, 10th Earl of Moray; she became the 19th Baroness Gray in 1895, upon the death of her own mother, née Lady Jane Stuart. After that, Lady Gray, who had separated from her husband in 1888, changed her children's surname to Gray.
Gray had four siblings:
James McLaren Stuart Gray, 20th Baron Gray (1864–1919)
Ethel Eveleen Gray, 21st Baroness Gray (1866–1946), married Henry Tufnell Campbell
Captain Lonsdale Richard Douglas Gray (1870–1900)
Thora Zelma Grace Gray (1875–1966), married Edward Lorne Frederick Clough-Taylor