Mrs Patrick Campbell (9 February 1865 – 9 April 1940), born Beatrice Stella Tanner and known informally as "Mrs Pat", was an English stage actress.
Campbell was born Beatrice Stella Tanner in Kensington, London, to John Tanner and Maria Luigia Giovanna, daughter of Count Angelo Romanini. She studied for a short time at the Guildhall School of Music. Her first marriage, from which she took the name by which she is generally known, produced two children, Alan "Beo" Urquhart and Stella, and ended with the death of her first husband in the Boer War in 1900.
Fourteen years later, Campbell became the second wife of George Cornwallis-West, a writer and soldier previously married to Jennie Jerome, the mother of Sir Winston Churchill. Notwithstanding her second marriage she continued to use the stage name "Mrs Patrick Campbell".