Purple Storm (Chinese: 紫雨風暴) is a 1999 Hong Kong action thriller film directed by Teddy Chan, and narrated by Daniel Wu, who also starred in the lead role.

The film co-stars Kam Kwok-leung, Emil Chau, Josie Ho, and Joan Chen.

Soong, a Khmer Rouge terrorist with plans to seed clouds with the chemical weapon Ricin-X, sends his son, Todd Nguyen and his friend Guan Ai, to Hong Kong in a North Korean ship.

While in custody, Todd receives medical treatment; Hong Kong Anti-Terrorist Force (ATF) Commander Ma Li soon learns Todd's not only a wanted criminal, but that his father and terrorist leader, Soong, plans to break him out with his Cambodian terrorist cell.

Kwan suggested implanting a new identity in Todd, making him an undercover operative for the police, but Ma initially objects on moral grounds.

He also finds broadcasts condemning the Khmer Rouge, so he plants a bomb, which is detonated the next day by an employee.

Soong demands that Ma bring Todd to the pedestrian bridge in Wan Chai North on the condition that he be alone.

At the meeting time, an explosion erupts in a nearby building, causing the occupants to rush across the bridge.

Believing he is undercover, Todd attempts to contact Ma when Guan hires a ship to recover the chemicals.

At ATF headquarters, the files found on Todd are cracked, revealing the plans to unleash the chemicals over Cambodia.

Ma realises the terrorists may be planning to hijack a plane to seed the clouds, and orders the Special Duties Unit to rush to Kai Tak.

Guan and Todd successfully infiltrate the hangar, where they kill the technicians and hijack a small plane and crew.