Betta St. John, born Betty Jean Striegler, November 26 1929, in Hawthorne, California is an American actress, singer and dancer.

St. John made her film debut at the age of ten in Destry Rides Again (1939) and as an orphan in Jane Eyre (1944). She was discovered by Rodgers and Hammerstein and played a small role in the Broadway musical, Carousel in 1945. By 1953, she created the role of Liat in the musical South Pacific and followed the production to London. In films, she appeared in The Robe (1953), Dream Wife (1953), All the Brothers Were Valiant (1953), and The Student Prince (1954). She continued to act in films and television until 1960 when she retired.

She was married to English actor Peter Grant from 1952 until his death in 1992.

Born in Hawthorne, California in 1929, the former Betty Striegler entered pictures as a juvenile. She made her film debut at age 10 in the unbilled role of a little girl who sings Marlene Dietrich's song "Little Joe" in the classic western Destry Rides Again (1939). She appeared in an Our Gang short and had another unbilled role in Jane Eyre (1944). Rodgers and Hammerstein took notice of this young, attractive singing/dancing talent and cast her in a small role in "Carousel" in 1945. When the musical team were ready to cast the role of Liat for their new musical "South Pacific" starring Mary Martin (I) and Ezio Pinza in 1949, they had to look no further than the beautiful, exotic-looking Betta. A blockbuster hit come opening night, she did the show's London tour and met British actor Peter Grant while there. They married in 1952 and settled at first in Hollywood. The splash she made on the musical stage led her back to films. Betta made her adult debut in Dream Wife (1953). In 1960, Betta decided to abandon the limelight. Her husband died in 1992.