Ghajini (pronounced [ɡədʒniː]) is a 2008 Indian Hindi-language action thriller film co-written and directed by A. R. Murugadoss in his Hindi film debut. A remake of the director's Tamil film of the same name, the film stars Aamir Khan, Asin Thottumkal, Jiah Khan and Pradeep Rawat. In the film, Sanjay Singhania, a powerful entrepreneur, suffers from anterograde amnesia after a violent attack on him and his fiancée Kalpana. The film marks Asin's Hindi film debut, in which she also reprised her role from the original version.

The original film's plot was inspired from Memento and Happy Go Lovely. Khan and Murugadoss co-wrote the remake, with Khan suggesting changes to suit the taste of the Hindi cinema audience. Allu Aravind, Madhu Mantena and Tagore Madhu jointly acted as the producers, while the film was distributed by Geetha Arts. A. R. Rahman composed the soundtrack and musical score, while cinematography and editing were handled by Ravi K. Chandran and Anthony.

Ghajini was theatrically released on 25 December 2008, where it became the highest-grossing Indian film of the year and the first Bollywood film to cross the ₹100 crore mark domestically, creating the 100 Crore Club. Ghajini's paid preview collections were ₹ 2.7 crore. It went on to become the highest-grossing Indian film of all time until it was surpassed by 3 Idiots. Aamir's character was featured in a 3D video game titled Ghajini – The Game, which is based on the film.