(born Sybil Anne Rivers, January 9, 1936 – September 11, 2019) was an American novelist who wrote stories set in the southern United States. Following her college graduation, Siddons worked in advertising, but her desire to write led her to journalism,[1] and in 1963 she became a writer for Atlanta magazine, where she eventually became a senior editor.

Siddons' debut novel was Heartbreak Hotel (1976). Peachtree Road, set in Atlanta, was a bestselling novel described as "the Southern novel for our generation" by Pat Conroy. More than a million copies are in print. In 1989 her book Heartbreak Hotel became a movie titled Heart of Dixie, which starred Ally Sheedy, Virginia Madsen, Phoebe Cates, Treat Williams, Kyle Secor, and Peter Berg.

In 1994, Siddons signed with HarperCollins to write four books for $13 million. She signed a three-book contract with Warner Books and her novel titled Off Season was released in 2008. Her novel "Burnt Mountain" made many best books of the year lists in 2011.