|Kowloon Walled City|
|Hanyu Pinyin||Jiǔ Lóng Chéng Zhài·Wéi Chéng|
|Jyutping||Gau2 Lung4 Sing4 Zaai3•Wai4 Sing4|
|Directed by||Cheang Pou-soi|
|Screenplay by|| Au Kin-yee |
|Based on||City of Darkness|
by Andy Seto
|Produced by||John Chong|
|Starring|| Louis Koo |
|Distributed by||Media Asia Distributions|
Kowloon Walled City is an upcoming Hong Kong martial arts film directed by Cheang Pou-soi and starring Louis Koo, Sammo Hung, Richie Jen and Raymond Lam. The film is an adaptation of the manhua City of Darkness by Andy Seto. 
Having been in development since the 2000s, production for the film officially began on 22 November 2021. 
The project had been in development since the 2000s, where it was set to be co-directed by John Woo and Johnnie To and star an all-star cast of Chow Yun-fat, Andy Lau, Tony Leung, Sean Lau, Louis Koo, Anthony Wong, Sun Honglei, Anita Yuen and Zhang Jingchu, with Nicolas Cage, James McAvoy, Li Baotian, Jang Dong-gun, Li Bingbing and Zhang Fengyi making special appearances, as shown on a teaser poster although nothing was confirmed. 
On 13 April 2013, Media Asia announced the project was to be titled Dragon City and set to be directed by Derek Kwok and starring Donnie Yen, who would also serve as action director and producer through his production company, Super Hero Films, and was set to begin production in September of that year.  
After seemingly stuck in development hell for several years, Media Asia once again announced the project on 28 February 2021, with Cheang Pou-soi set to direct while Koo, Richie Jen and Zhang Jin are set to star.  Principal photography Kowloon Walled City officially began on 22 November 2021, which was revealed when the in a post on the film's official Facebook page although the cast was not revealed yet until the film held its production commencement ceremony on 30 November, which was attended by Cheang, producers John Chong and Wilson Yip and cast members Koo, Sammo Hung, Jen, Raymond Lam, Terrence Lau, Kenny Wong, Tony Wu, German Cheung, Philip Ng, Tommy Chu and Chung Suet-ying. There, Koo reveals that two replica sets of the Kowloon Walled City was built for filming while actual magazines, record albums, televisions and commercials from the 1980s will be used as props.   All the main cast spent a year training to prepare for the film's fight scenes. 
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