Dev is a 2019 Indian Tamil-language romantic action-adventure film written and directed by Rajath Ravishankar on his directorial debut. The film stars Karthi and Rakul Preet Singh, with Prakash Raj and Ramya Krishnan playing supportive and pivotal roles in the film. Harris Jayaraj has been roped into score music for the film while cinematography is handled by R. Velraj and editing is done by Anthony L. Ruben. The film marks the first collaboration between Karthi and music director Harris Jayaraj. The film was earlier scheduled to have its theatrical release on the eve of Christmas, and later scheduled to post Thai Pongal but was postponed due to tight race at the box office.

The film was scheduled to have its theatrical release on 14 February 2019 on the eve of Valentine's Day. It premiered in the United States, a day before the original release. The film received lukewarm reviews upon release from critics, which led the makers to trim its duration after releasing.