Massu Engira Masilamani (transl. Masilamani alias Massu), also known by its former title Masss, is a 2015 Indian Tamil-language action horror comedy film directed by Venkat Prabhu. The film was produced by K. E. Gnanavel Raja under his Studio Green banner alongside his then-newly formed studio Aadnah Arts, and was distributed by Eros International and Dream factory. The film features an ensemble cast including Suriya, Nayanthara, Pranitha Subhash, Premgi

, Parthiban and Samuthirakani. Yuvan Shankar Raja composed the film's soundtrack and score, whereas cinematography and editing were handled by R. D. Rajasekhar and Praveen K. L. respectively. In the film Masss, A con artist starts interacting with ghosts when his partner in crime dies in an accident. During one such encounter, he stumbles upon Shakthi, a ghost who wants to seeks revenge against his family's killers.

The film was launched in April 2014, and the principal photography was commenced in July 2014 and completed in April 2015. Filming took place in various locations of India and Bulgaria. The film's title Masss, was announced in July 2014, however in order to receive exemption from entertainment tax, the film's title was changed to Massu Engira Masilamani.The film was released worldwide on 29 May 2015. A Telugu dubbed version, titled Rakshasudu, was released simultaneously in Andhra Pradesh and Telangana. It was later remade by SVF in Bengali as Naqaab starring Bangladeshi superstar Shakib Khan, Nusrat Jahan and Sayantika Banerjee.