9½ Weeks is an American erotic romantic drama film from 1986, directed by Adrian Lyne, and starring Kim Basinger and Mickey Rourke. Basinger stars as a NYC art gallery employee who has a brief yet intense affair with a mysterious Wall Street broker. The screenplay by Sarah Kernochan, Zalman King and Patricia Louisianna Knop is adapted from the 1978 memoir of the same name by Austrian-American author Ingeborg Day, under the pseudonym "Elizabeth McNeill".

The film was completed in 1984, but did not get released until February 1986. Considered too explicit by its American distributor Metro-Goldwyn-Mayer, the film was heavily edited for release in the United States, where it was a box office bomb, grossing $6.7 million on a $17 million budget. It also received mixed reviews at the time of its release. However, its soundtrack sold well and the film itself became a huge success internationally in its unedited version, particularly in Australia, Canada, France, Germany, and the United Kingdom, making $100 million worldwide. It has also acquired a large fanbase on video and DVD and has developed a cult following.