Prequel could refer to:
- Season 4 Prequel - The prequel to Season 4, showing Jack's firing and Tomas Sherek's entry to the USA.
- Season 5 Prequel - The prequel to Season 5, showing Jack meeting with Chloe O'Brian in Chicago.
- Season 6 Prequel - The prequel to Season 6, showing Jack attempting to escape captivity in China.
- 24: Redemption - The prequel to Season 7, showing Jack battling against a military coup in Sangala.