| In the Line of Duty 4: Witness | |
|---|---|
 Theatrical poster | |
| Traditional Chinese | 皇家師姐IV直擊証人 |
| Simplified Chinese | 皇家师姐IV直击证人 |
| Hanyu Pinyin | Huáng Jiā Shī Jiě Sì Zhí Jī Zhèng Rén |
| Jyutping | Wong4 Gaa1 Si1 Ze2 Sei3 Zik6 Gik1 Zing3 Jan4 |
| Directed by | Yuen Woo-ping |
| Written by | Anthony Wong Cheung Chi-sing Kim Yip |
| Produced by | Stephen Shin |
| Starring | Cynthia Khan Michael Wong Donnie Yen |
| Cinematography | Ma Koon-wah Au Kam-hung |
| Edited by | D & B Film Editor Group |
| Music by | Richard Yuen Tang Siu-lam |
Production company | |
| Distributed by | D & B Films Co., Ltd. |
Release date |
|
Running time | 94 minutes |
| Country | Hong Kong |
| Language | Cantonese |
| Box office | HK$12,100,193 |
In the Line of Duty 4: Witness (a.k.a. In the Line of Duty Part 4) is a 1989 Hong Kong action film directed by Yuen Woo-ping. The film stars Cynthia Khan, Michael Wong, and Donnie Yen. The film was released theatrically in Hong Kong on 21 July 1989.
The film is nominally part of the loosely connected In the Line of Duty and Yes, Madam! series. The alternative titles of this and other films in the series can be cause for confusion.