Dil Se.. is a 1998 Indian Hindi-language romantic thriller film written and directed by Mani Ratnam who produced it with Ram Gopal Varma and Shekhar Kapur. Set against the backdrop of Insurgency in Assam, the film stars Shah Rukh Khan and Manisha Koirala, while Preity Zinta makes her film debut in a supporting role. An example of parallel cinema, it is noted as the final installment in Ratnam's trilogy consisting of Roja (1992) and Bombay (1995). The film's soundtrack album, composed by A. R. Rahman, sold six million units in India.

A romantic thriller is a narrative that involves elements of the romance and thriller genres. A good thriller provides entertainment by making viewers uncomfortable with moments of suspense, or the heightened feeling of anxiety and fright. A thriller is more a familiar concept and description than a pure genre. A typical genre can vary from comedy and melodrama to adventure and romance. All thrillers are a combination of different genres. The basic thriller trait of suspense fits with some genres better than others. For example, crime, sci-fi and romance allow more scope for suspense than screwball comedies or musicals do.