Shirley Hardie Jackson (December 14, 1916 – August 8, 1965) was an American writer known primarily for her works of horror and mystery. Her writing career spanned over two decades, during which she composed six novels, two memoirs, and more than 200 short stories.

Born in San Francisco, California, Jackson attended Syracuse University in New York, where she became involved with the university's literary magazine and met her future husband Stanley Edgar Hyman. After they graduated, the couple moved to New York City and began contributing to The New Yorker, with Jackson as a fiction writer and Hyman as a contributor to "Talk of the Town". The couple settled in North Bennington, Vermont, in 1945, after the birth of their first child, when Hyman joined the faculty of Bennington College.

After publishing her debut novel, The Road Through the Wall (1948), a semi-autobiographical account of her childhood in California, Jackson gained significant public attention for her short story "The Lottery", which presents the sinister underside of a bucolic American village. She continued to publish numerous short stories in literary journals and magazines throughout the 1950s, some of which were assembled and reissued in her 1953 memoir Life Among the Savages. In 1959, she published The Haunting of Hill House, a supernatural horror novel widely considered to be one of the best ghost stories ever written. Jackson's final work, the 1962 novel We Have Always Lived in the Castle, is a Gothic psychological horror novel that has been described as her masterpiece.

By the 1960s, Jackson's health began to deteriorate significantly, ultimately leading to her death due to a heart condition in 1965 at the age of 48.

Jackson was of English ancestry, and her mother Geraldine traced her family heritage to the Revolutionary War hero General Nathanael Greene. Jackson's maternal great-grandfather, John Stephenson, had been a prominent lawyer in San Francisco—later a Superior Court Judge in Alaska—while her great-great grandfather was Samuel Charles Bugbee, an architect whose works included the homes of Leland Stanford and Charles Crocker and the Mendocino Presbyterian Church. Jackson said:

My grandfather was an architect, and his father, and his father. One of them built houses only for millionaires in California and that's where the family wealth came from, and one of them was certain that houses could be made to stand on the sand dunes of San Francisco, and that's where the family wealth went.

Jackson's maternal grandmother, nicknamed "Mimi", was a Christian Science practitioner who continued to practice spiritual healing on members of the family after her retirement. Jackson was known to critically assess such attempts, recounting a time when Mimi claimed to have broken her leg and healed it through prayer overnight, though she had really only lightly sprained her ankle. When Mimi died, Jackson told her daughter that she "died of Christian Science." While she believed that religion could easily become a vehicle for harm, the religious influences from her childhood are clear in Jackson's writing, which includes themes of mysticism, mental power, and witchcraft.

Jackson was born December 14, 1916, in San Francisco, California, to Leslie Jackson and his wife Geraldine (née Bugby).