Infernal Affairs III is a 2003 Hong Kong crime action film directed by Andrew Lau and Alan Mak. It is the third and final installment in the Infernal Affairs film series, and is both a sequel and a semi-prequel to the original film, as it intercuts events before and after the events in the first film. Andy Lau, Tony Leung, Kelly Chen, Anthony Wong, Eric Tsang, and Chapman To reprise their roles again, joined by new cast members Leon Lai and Chen Daoming.

Tony Leung Chiu-wai is a Hong Kong actor and singer. He is one of Asia's most successful and internationally recognized actors. He has won many international acting prizes, including the Cannes Film Festival award for Best Actor for his performance in Wong Kar-wai's film In the Mood for Love. He was named by CNN as one of "Asia's 25 Greatest Actors of All Time".