Infernal Affairs II is a 2003 Hong Kong crime-thriller film directed by Andrew Lau and Alan Mak.

It is a prequel to the 2002 film Infernal Affairs. Anthony Wong, Eric Tsang, Edison Chen, Shawn Yue, and Chapman To reprise their roles from the original film alongside new cast members Carina Lau, Francis Ng, Roy Cheung and Hu Jun. Both Tony Leung and Andy Lau, who played the central roles in the original, do not appear in the film, as they are replaced by the younger versions played by Yue and Chen, respectively. The events of the film take place from 1991 to 1997.