Deborah Jane Trimmer (30 September 1921 – 16 October 2007), known professionally as Deborah Kerr (/kɑːr/), was a Scottish actress. Known as "The English Rose" due to her red hair, Kerr rose to fame for her portrayals of proper, ladylike women, often navigating societal expectations and stereotypes. Kerr attracted wide praise for her work, earning six Academy Award nominations for Best Actress, and became regarded as one of the best actresses of her generation. From the 1940s to the early 1960s, she was one of the most popular actresses in the world.

Following a brief career as a ballerina, Kerr moved to the stage and acted in various Shakespeare productions and small plays before making her film debut in Major Barbara (1941). This led to additional leading roles which raised her profile, such as Love on the Dole (1941), Hatter's Castle (1942), and The Day Will Dawn (1942). In 1943, Kerr played three women in Michael Powell and Emeric Pressburger's romantic-war drama The Life and Death of Colonel Blimp, which consistently ranks among the greatest British films of all time. Following major successes in the spy comedy I See a Dark Stranger (1946) and psychological drama Black Narcissus (1947), Kerr transitioned to Hollywood under the helm of Metro-Goldwyn-Mayer Studios (MGM).

Following the lukewarm success of her debut Hollywood features, The Hucksters and If Winter Comes, both in 1947, Kerr found critical praise in Edward, My Son (1949), for which she received her first Academy Award nomination for Best Actress, becoming the first Scottish person to be nominated for an acting Oscar. Though she found major commercial success in King Solomon's Mines (1950) and Quo Vadis (1951), the latter the highest grossing film of 1951, reviews were often lackluster for her performances, highlighting her typecasting. In 1953, Kerr had a critical resurgence in the major hit From Here to Eternity, which reestablished her as a serious actress and earned her a second Academy Award nomination for Best Actress.

Throughout the 1950s, Kerr starred in a string of major commercial and critical successes. She earned three consecutive Academy Award nominations for The King and I (1956), Heaven Knows, Mr. Allison (1957), and Separate Tables (1958), and starred in the progressive drama Tea and Sympathy (1956), and the romantic classic An Affair to Remember (1957). By the 1960s, her career had slowed, though she remained somewhat prominent in film due to successful roles in The Sundowners (1960), The Grass Is Greener (1960), The Innocents (1961), and The Night of the Iguana (1964). She made sporadic appearances in films until The Assam Garden in 1985, which was her final film role.  

Kerr received numerous accolades throughout her career, including two Golden Globe Awards and nominations for six Academy Awards, four British Academy Film Awards, and an Emmy Award. In 1994, having already received honorary awards from the Cannes Film Festival and BAFTA, Kerr received an Academy Honorary Award with a citation recognizing her as "an artist of impeccable grace and beauty, a dedicated actress whose motion picture career has always stood for perfection, discipline and elegance."

Deborah Jane Trimmer was born on 30 September 1921 in Hillhead, Glasgow, the only daughter of Kathleen Rose (née Smale) and Capt. Arthur Charles Kerr Trimmer, a World War I veteran and pilot who lost a leg at the Battle of the Somme and later became a naval architect and civil engineer. Trimmer and Smale married, both aged 28, on 21 August 1919 in Smale's hometown of Lydney, Gloucestershire.

Young Deborah spent the first three years of her life in the Scottish west coast town of Helensburgh, where her parents lived with Deborah's grandparents in a house on West King Street. Kerr had a younger brother, Edmund Charles (born 31 May 1926), who became a journalist. He died, aged 78, in a road rage incident in 2004.

Kerr was educated at the independent Northumberland House School, Henleaze in Bristol, England, and at Rossholme School, Weston-super-Mare. Kerr originally trained as a ballet dancer, first appearing on stage at Sadler's Wells in 1938. After changing careers, she soon found success as an actress. Her first acting teacher was her aunt, Phyllis Smale, who worked at a drama school in Bristol run by Lally Cuthbert Hicks. She adopted the name Deborah Kerr on becoming a film actress ("Kerr" was a family name going back to the maternal grandmother of her grandfather Arthur Kerr Trimmer).