Twilight of the Warriors: Walled In (simplified Chinese: 九龙城寨之围城; traditional Chinese: 九龍城寨之圍城; Jyutping: gau2 lung4 sing4 zaai6 zi1 wai4 sing4; lit. 'The Siege of Kowloon Walled City') is a 2024 action film directed by Soi Cheang, and starring Louis Koo, Sammo Hung, Richie Jen, Raymond Lam, Terrance Lau, Kenny Wong, Philip Ng, Tony Wu and German Cheung. The film was based on the novel City of Darkness by Yuyi and the manhua of the same name by Andy Seto.

Having been in development since the 2000s, production for the film officially began in November 2021 and wrapped in April 2022. The film was released in Hong Kong and China on 1 May 2024, and was selected to be in the Official Selection (Midnight Screening) of the 2024 Cannes Film Festival, as part of screened out of competition. The film received critical acclaim.

The film became the second-highest-grossing domestic film of all time in Hong Kong. The film was selected as Hong Kong’s official entry for Best International Feature Film at the 97th Academy Awards.