Doreen Geraldine Knatchbull, Baroness Brabourne, CI DStJ (née Lady Doreen Geraldine Browne; 29 May 1896 – 28 August 1979) was an Anglo-Irish aristocrat and socialite. She died as a result of her injuries following an attack by the Provisional IRA in August 1979, when a boat was bombed off the coast of County Sligo. The bomb targeted Lord Louis Mountbatten, who was also killed in the explosion.