Ghajini (pronounced [gadʐini]) is a 2005 Indian Tamil-language action thriller film directed by A. R. Murugadoss and produced by Salem Chandrasekharan. The film stars Suriya, Asin, Nayanthara and Pradeep Rawat. Harris Jayaraj composed the soundtrack and background music, while R. D. Rajasekhar and Anthony were the film's cinematographer and editor, respectively. In the film, a rich eminent businessman develops anterograde amnesia due to a head injury he sustains while attempting to save his lover from getting murdered by a gangster and human trafficker. After that, he sets out to avenge her murder with the aid of photographs from an instant camera and permanent tattoos on his body.

The film's production began shortly afterwards in April and was completed by September on the same year. The film was shot at Chennai, while two song sequences were filmed in Switzerland. It was dubbed and released in Telugu by Allu Aravind in November 2005, and received positive reviews with praise for the performances of the lead pair and the plot. It was remade into a Hindi film with the same name by Murugadoss again in 2008, with Asin and Rawat reprising their roles, with the former debuting in Bollywood, and Aamir Khan in lead. The film's story takes inspiration from the Christopher Nolan film Memento (2000) and the 1951 film Happy Go Lovely.