Athithi (transl. Guest) is a 2014 Indian Tamil-language thriller film written and directed by "Punch" Bharathan, who worked as a dialogue writer in films such as Ghilli, Dhill and Dhool and in his second directorial film after the Vijay-starrer Azhagiya Tamil Magan.

Produced by KP Ramakrishnan Nair, the film stars Nandha, Nikesh Ram, and Ananya, while Yuvina Parthavi, Varsha Ashwathi, Thambi Ramaiah, and Sendrayan play pivotal roles. The film is a remake of the 2010 Malayalam film Cocktail (2010), which was the actual remake of Butterfly on a Wheel. The film was released on 27 June 2014.

Athithi is an edge-of-the seat, realistic thriller about a life-changing - or ruining - day in the picture-perfect life of a successful and determined young man. In the world today, the list of necessities begins with a satisfying job and ends with wealth, and luxury is a happy family along with the package. When life is complete with all that, how bizarre can a normal day get, toppling the niceties altogether?