Dame Gladys Constance Cooper (December 18, 1888 – November 17, 1971) was a British actress. Her career spanned almost seventy years in movies, on stage and in television. She performed in stage plays including "The Dollar Princess", "The Importance of Being Earnest" and "Bluebell in Fairyland", the latter of which was a musical. However, it was not until 1922 that she found strong success. Her most notable movies included "The Secret Garden" in 1949, "The Valley of Decision" and "My Fair Lady" in 1964.