- Played the mother of Professor Henry Higgins in a Hallmark Hall of Fame (1951) television version of Pygmalion and the movie version of the musical My Fair Lady (1964).
- Twice nominated for Broadway's Tony Award as Best Actress (Dramatic) for her performances in Enid Bagnold's "The Chalk Garden" (1956) and in "A Passage to India" (1962).
- Appeared in five films that were nominated for the Best Picture Oscar: Rebecca (1940), Kitty Foyle (1940), The Song of Bernadette (1943), Separate Tables (1958), and My Fair Lady (1964). Of those, Rebecca (1940) and My Fair Lady (1964) are winners in the category.
- She was awarded the DBE (Dame Commander of the Order of the British Empire) in the 1967 Queen's Birthday Honours List for her services to drama.
- She has appeared in three films that have been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: Rebecca (1940), Now, Voyager (1942) and My Fair Lady (1964).
- Wrote autobiography - 'Without Veils'.
- Mother-in-law of Robert Morley.
- Grandmother of the author/critic/entertainer Sheridan Morley, Annabel Morley, Wilton Morley, Emma Hardy and Justine Hardy.
- Gladys Cooper didn't begin her Hollywood career until she was 52 in the 1940 film of Rebecca.
- A memorial service was held for her at St. Paul's Church, Covent Garden on 18th December 1971.
- Mother, with Herbert Buckmaster, of actors Joan Buckmaster and John Buckmaster.
- She appeared in two Best Picture Academy Award winners: Rebecca (1940) and My Fair Lady (1964).
- Appeared with Jennifer Jones in three films: "The song of Bernadette" (1943), "Love letters" (1945), and "Madame Bovary" (1949).
- Mother, with Sir Neville Pearson, of costume designer Sally Pearson.
- Ex-mother-in-law of Robert Hardy.
- Famed British novelist and poet Stevie Smith was the secretary of Gladys' second husband Sir Neville Pearson.
- Daughter of Charles (1844-1939) and Mabel (née Barnett) Cooper (1861-1944).
- "Actresses of a Certain Character: Forty Familiar Hollywood Faces from the Thirties to the Fifties" by Axel Nissen has a short biography of her, focusing on her movie career as a character actress.
- Is one of 27 actresses to have received an Academy Award nomination for their performance in a musical; hers being My Fair Lady (1964). The others, in chronological order, are: Bessie Love (The Broadway Melody (1929)), Grace Moore (One Night of Love (1934)), Jean Hagen (Singin' in the Rain (1952)), Marjorie Rambeau (Torch Song (1953)), Dorothy Dandridge (Carmen Jones (1954)), Deborah Kerr (The King and I (1956)), Rita Moreno (West Side Story (1961)), Julie Andrews (Mary Poppins (1964), The Sound of Music (1965) and Victor/Victoria (1982)), Debbie Reynolds (The Unsinkable Molly Brown (1964)), Peggy Wood (The Sound of Music (1965)), Carol Channing (Thoroughly Modern Millie (1967)), Kay Medford (Funny Girl (1968)), Barbra Streisand (Funny Girl (1968)), Liza Minnelli (Cabaret (1972)), Ronee Blakley (Nashville (1975)), Lily Tomlin (Nashville (1975)), Ann-Margret (Tommy (1975)), Lesley Ann Warren (Victor/Victoria (1982)), Amy Irving (Yentl (1983)), Nicole Kidman (Moulin Rouge! (2001)), Queen Latifah (Chicago (2002)), Catherine Zeta-Jones (Chicago (2002)), Renée Zellweger (Chicago (2002)), Jennifer Hudson (Dreamgirls (2006)), Penélope Cruz (Nine (2009)), Anne Hathaway (Les Misérables (2012)), Meryl Streep (Into the Woods (2014)), and Emma Stone (La La Land (2016)).
- Stepmother of John Merivale.
- Early in her career she was voted The Most Beautiful Girl in the World.
- In Italy, most of her films were dubbed by either Giovanna Scotto or Tina Lattanzi. She was occasionally dubbed by Rosetta Calavetta, Lola Braccini and Wanda Tettoni in the much-loved My Fair Lady (1964).
- She had a daughter Sally.
- Robert Morley and Robert Hardy are her sons in law.
- Wrote her autobiography Without Veils.
- Made her stage debut at the Theatre Royal Colchester in December1905.
- She lived at Henley on Thames.
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