| In the Line of Duty 4: Witness | |
|---|---|
| Traditional | 皇家師姐IV直擊證人 |
| Simplified | 皇家师姐IV直击证人 |
| Mandarin | Huáng Jiā Shī Jiě Sì Zhí Jī Zhèng Rén |
| Cantonese | Wong4 Gaa1 Si1 Ze2 Sei3 Zik6 Gik1 Zing3 Jan4 |
| Directed by | Yuen Woo-ping |
| Produced by | Stephen Shin |
| Written by | Anthony Wong Cheung Chi Sing Kim Yip |
| Starring | Donnie Yen Michael Wong Cynthia Khan |
| Music by | Richard Yuen Tang Siu Lam |
| Cinematography | Ma Koon Wah Au Kam Hung |
| Editing by | D & B Film Editor Group |
| Studio | D & B Films Co., Ltd. |
| Distributed by | D & B Films Co., Ltd. |
| Release date(s) | 21 July 1989 |
| Running time | 94 minutes |
| Country | Hong Kong |
| Language | Cantonese |
| Gross revenue | HK$12,100,193 |
In the Line of Duty 4: Witness (aka In the Line of Duty) is a 1989 Hong Kong action film directed by Yuen Woo-ping, and starring Donnie Yen, Michael Wong and Cynthia Khan.
The film is nominally part of the loosely connected In the Line of Duty/Yes, Madam! series. The alternative titles of this and other films in the series can be cause for confusion.