- Country: Hong Kong
- Genres: Action, Crime, Mystery
- Release: 2007-11-29
- Director: Johnnie To , Wai Ka-fai
- Writers: Wai Ka-fai , Au Kin-Yee
- Language: Cantonese | English
- Stars: Lau Ching-wan , Andy On , Gordon Lam , Kelly Lin , Lee Kwok-Lun , Karen Lee Choi-Ling , Flora Chan , Eddie Cheung , Lam Suet , Jay Lau
- Runtime: 89 min
- Awards: 7 wins & 11 nominations
- AKA: Mad Detective , 神探 (China) , San taam , Mad Detective (Germany) , Безумный следователь (Russian Federation) , Miraculous Detective (Hong Kong) , 神探 (Taiwan) , Mad Detective (France, French Republic) , Mad Detective (Hong Kong) , 神探 (Hong Kong) , Sílený detektiv (Czech Republic) , Mad detective (Spain) , Thám Tử Khùng (Vietnam) , Mad Detective (United States of America) , Mad Detective (United Kingdom) , MAD探偵 7人の容疑者 (Japan) , Postrzelony detektyw (Poland) , Őrült nyomozó (Hungary)
- Plot:
A rookie cop teams up with a former detective with a supernatural gift to hunt down a serial killer.
- IMDB:tt0969269
Mad Detective Cast · · · ALL
Johnnie To
Director
Wai Ka-fai
Director
Lau Ching-wan
Inspector Chan Kwai Bun
Andy On
Inspector Ho Ka-on
Gordon Lam
Ko Chi Wai
Kelly Lin
May Cheung
Lee Kwok-Lun
Wong Kwok Chu
Karen Lee Choi-Ling
Gigi
Flora Chan
May Cheung in Bun's Eyes
Eddie Cheung
Violent Man - Ko's Inner Personality
Lam Suet
Fatso - Ko's Inner Personality
Jay Lau
Calculating Woman - Ko's Inner Personality
Eddy Ko
The Chief
Jo Kuk Cho-Lam
Ho Ka-on's Inner Personality
Jonathan Lee Yat-Sing
Weak Boy - Ho's Inner Personality
Ling To Yuen
Policeman
Ronald Yan
Chi-Wai's Boss
Jack Lai
Ko's Colleague
Ka-kit Cheung
Ko's Inner Personality
Singh Hartihan Bitto
Naresh Sharma
Lui Siu-Ming
Mahjong Parlour's Staff (uncredited)
Soi Cheang
Inspector Ho Ka-on (voice)