Ek Hasina Thi (Devnagari: एक हसीना थी, English: There Was A Beautiful Woman) is a 2004 Indian psychological thriller film noir by Sriram Raghavan, produced by Ram Gopal Varma, and starring Urmila Matondkar and Saif Ali Khan in the lead roles. The screenplay was by Sriram Raghavan and Pooja Ladha Surti. The film received rave reviews upon release.

Sarika Vartak (Urmila Matondkar), a simple travel agent meets a handsome businessman Karan Rathod (Saif Ali Khan). She starts falling for him. One day, Karan's friend hands her a bag for safe keeping. Later police raid her apartment & the bag is found to have illegal firearms. Karan's advocate Kamlesh Mathur (Aditya Srivastav) tricks her into confessing that she was an accomplice. She is sentenced to 7 years in Jail. Sarika falls for the trap, but before she realizes it, the damage has been done. Under the tutelage of Pramila (Pratima Kazmi), an inmate, Sarika escapes prison and sets out to take revenge on Karan in a dangerous game.

Karan is a rich, suave businessman. But he can also be very possessive of Sarika. His temper can flare at slightest pretext. After Karan involves Sarika in looking after a suitcase full of illegal firearms belonging to his friend, a hitman, she is arrested for having links with the underworld and is remanded to judicial custody. Karan claims innocence to her, and sends her a defense attorney to fight her case. The attorney advises her to confess the crime, arguing that there is no proof exonerating her.