Ekk Deewana Tha (Hindi: एक दीवाना था; English: There Was A Crazy Guy ) is a 2012 Hindi language romantic drama film, written and directed by Gautham Menon, featuring Prateik Babbar and Amy Jackson in Amy's Bollywood debut, and in lead roles. This film is a remake of Gautham Menon's own 2010 Tamil blockbuster classic, Vinnaithaandi Varuvaayaa, which was simultaneously shot into Telugu as Ye Maaya Chesave in 2010, featuring soundtrack and film score composed by A. R. Rahman, while the cinematography and editing are handled by Ravi K. Chandran and Anthony Gonsalves, respectively. Singer Chinmayi has provided the talking voice of the female lead, reprising her role from the original Tamil version and the Telugu simultaneously made version where she dubbed for actresses Trisha Krishnan and Samantha Ruth Prabhu respectively.

While on production stage, the film was titled Prem Katha, but was renamed as Ekk Deewana Tha, as the director wanted some abstract title for the film, similar to the original. The film, produced by Fox Star Studios, a subsidiary of Hollywood studio 20th Century Fox, Photon Kathaas and R.S. Infotainment was released on 17 February 2012 in two different versions with a number of endings to suit the taste of regional viewers. The film opened to universally mixed reviews and had a lukewarm reception at the box office.