While Yeung Kam Wing is trying to remove all connections between the mob and him, his actions are being carefully observed by Lau Kin Ming, who bears a personal grudge against him.
You can now watch Infernal Affairs III online on the following streaming providers in the United States.
| Directing | Alan Mak | Director |
| Writing | Felix Chong | Writer |
| Directing | Andrew Lau Wai-Keung | Director |
| Production | Andrew Lau Wai-Keung | Producer |
| Sound | Chan Kwong-Wing | Music |
| Editing | Danny Pang | Editor |
| Crew | Ng Man-Ching | Cinematography |
| Crew | Andrew Lau Wai-Keung | Cinematography |
| Art | Bill Lui Cho-Hung | Art Direction |
| Production | Ronald Wong Ban | Coordinating Producer |
| Crew | Wong Wai-Fai | Stunt Coordinator |
| Production | John Chong | Executive Producer |
| Production | Gao Feng Jun | Producer |
| Production | Han Hong Fei | Executive Producer |
| Production | Lorraine Ho | Line Producer |
| Production | Ellen Chang | Line Producer |
| Editing | Curran Pang | Editor |
| Costume & Make-Up | Silver Cheung | Costume Design |
| Crew | Simon Chan Kwok-Hong | Makeup Effects |
| Costume & Make-Up | Cheng Yu-Lai | Makeup Artist |
| Costume & Make-Up | Siu Wai Ngok | Makeup Artist |
| Costume & Make-Up | Vickey Yat-Ping Tsang | Hairstylist |
| Costume & Make-Up | Samuel Wong | Hairstylist |
| Directing | Steve Chan Wai-Hung | Second Assistant Director |
| Directing | Cash Chin Man-Kei | First Assistant Director |
| Directing | Ask Lee | Third Assistant Director |
| Directing | Jonathan Li | Third Assistant Director |
| Sound | Felix Chung Sze-Ming | Sound Effects Editor |
| Sound | George Lee Yiu-Keung | Sound Re-Recording Mixer |
| Sound | Leung Lik-Chi | Sound Mixer |
| Sound | Kinson Tsang King-Cheung | Sound Designer |
| Crew | Fok Kam Tong | Special Effects |
| Visual Effects | Terry Lam | Visual Effects Director |
| Visual Effects | Eddy Wong | Visual Effects Supervisor |
| Visual Effects | Victor Wong | Visual Effects Supervisor |
| Visual Effects | Ray Wu | Visual Effects Producer |
| Camera | Jai Ip | Steadicam Operator |
| Camera | Jimmy Wong | Steadicam Operator |
