The main cast for "Prison on Fire III" includes:
* Tony Leung Ka-Fai as Chung Tin-Yeung (Prison Warden)
* Lau Ching-Wan as Lau Chi-Chung (Prisoner)
* Maggie Cheung as Ho Yin-Ling (Prisoner's Girlfriend)
* Michael Wong as Prisoner
* Sean Lau as Prisoner
The film also features several other well-known Hong Kong actors in supporting roles.