The Masked Prosecutor is a 1999 Hong Kong action film directed by Herman Yau and starring Louis Koo, Blackie Ko and Jordan Chan.

In Hong Kong, a vigilante known as the Masked Prosecutor have been punishing criminals who were sentenced not guilty by the court, which include a 15-year-old teenager (Lam Tsz-sin) who pushed a couple down the hill in a robbery but was proven to be psychopathic, Ng Mang (Frankie Ng), a triad leader involved in a gang negotiation in Temple Street which caused one killed and three injured but was released due to lack of evidence, and Leung Siu-chueng (Wayne Lai), director of Yun Man Industry Limited who was acquitted from a rape charge because the jury believed the accuser was having too much sex fantasies.

Guy's daughter, Siu-yu (Grace Yip) shows Wah a photo album with pictures of her family along with a picture of Guy with his godsons, Tong Hiu-tai (Louis Koo) and Wan Chi-nin (Michael Tse), who were also police officers and the trio were known as the Three Eagles of Mongkok.

At this time, it is also reported that Kwong Cho-foon (Lo Mang), who was involved in a gold shop robbery two years ago where he also killed a man and crippling his daughter, have been acquitted of all charges.

On the night of the operation, the Masked Prosecutor appears, attacking and attempts to abduct Kwong in a massage parlour before being interfered by Wah.

Guy has planned to quit the force if Hiu-tai loses his job, but refrains after realizing he would be missing out HK$1 million of pension after he retire.

To continue on the investigation, Guy and Wah visit the Solvia-Pokka-Fuji Family Rehab Center, where Hiu-tai used to hang out with his girlfriend Ada (Jessica Hsuan), who was Chi-nin's older sister.

Hiu-tai believes he is doing the right thing because the world is unfair that criminals can get away from the justice as long as they can afford to pay good lawyers.

[1] Kenneth Brorsson of So Good Reviews praises the film's scharacters and the chemistry of the cast but notes the script as being weak.

[4] The film grossed HK$1,228,689 at the Hong Kong box office during its theatrical run from 9 to 24 December 1999.