
- Country: Hong Kong
- Genres: Action, Crime, Drama
- Release: 2002-12-12 (Hong kong), 2003-09-05 (China), 2016-03-17 (South Korea)
- Director: Andrew Lau , Alan Mak
- Writers: Felix Chong Man-Keung
- Language: Cantonese | English | Thai
- Stars: Andy Lau , Tony Chiu Wai Leung , Anthony Wong , Eric Tsang
- Runtime: 101 min
- Awards: 24 wins & 26 nominations
- AKA: Infiltrados (Portugal, Portuguese Republic) , Σατανικές υποθέσεις (Greece) , Wu jian dao (Hong Kong) , Affaires internes (Canada) , Afaceri infernale (Romania) , Infernal Affairs (France, French Republic) , Infernal Affairs (Italy) , Vô Gian Đạo (Vietnam) , Volavka (Czech Republic) , Двойная рокировка (Russian Federation) , Sho'un jahanamiah (Egypt) , A'mal-e sheytani (Iran) , Volavka (Slovakia (Slovak Republic)) , Conflitos Internos (Brazil) , Szigorúan piszkos ügyek (Hungary) , Infernal Affairs (Sweden) , 無間道 (Taiwan) , Infernal Affairs (United States of America) , Пъклени дела (Bulgaria) , Dviguba rokiruote (Lithuania) , Punë të skëterrshme (Albania) , Infernal Affairs , Mou gaan dou (Hong Kong) , Infernal Affairs (Denmark) , Infanaru Afea (Japan) , Põrgulik amet (Estonia) , Infernal Affairs (Finland) , Infernal Affairs - Die achte Hölle (Germany) , Juego sucio (Spain) , Mou gaan dou (Australia) , Infernal Affairs (Germany) , Infernal Affairs (Norway) , Non-Stop Way (Hong Kong) , Infernal Affairs: Piekielna gra (Poland) , Mou gaan dou , Подвійна рокіровка (Ukraine) , インファナル・アフェア (Japan) , Kirli İşler (Turkey) , O anthropos tou nomou (Greece) , Notranje vražje zadeve (Slovenia) , Pakleni poslovi (Serbia) , Infernal Affairs (United Kingdom) , Asuntos infernales (Argentina) , Satanikes ypotheseis (Greece)Mou gaan dou, 无间道, 無間道
- Plot: Chan Wing Yan, a young police officer, has been sent undercover as a mole in the local mafia. Lau Kin Ming, a young mafia member, infiltrates the police force. Years later, their older counterparts, Chen Wing Yan and Inspector Lau Kin Ming, respectively, race against time to expose the mole within their midst.
- IMDB:tt0338564


Infernal Affairs Cast

Andrew Lau
Director

Alan Mak
Director

Andy Lau
Inspector Lau Kin Ming

Tony Chiu Wai Leung
Chen Wing Yan

Anthony Wong
SP Wong Chi Shing

Eric Tsang
Hon Sam