One Second Champion (Chinese: 一秒拳王) is a 2021 Hong Kong sports film directed by Chiu Sin Hang, marking his second feature film project after Vampire Cleanup Department (2017). Chiu also takes on a lead role, alongside Endy Chow, Chanon Santinatornkul, and Lin Min Chen, portraying an asthmatic heir of a boxing gym who transforms a gambling addict with an ability to see one second into the future (played by Chow) into a professional boxer.

The film premiered as the closing film of 17th Hong Kong Asian Film Festival on 22 November 2020, and was theatrically released on 11 March 2021, in Hong Kong. It was named a Film of Merit in the 27th Hong Kong Film Critics Society Awards and received four nominations in the 40th Hong Kong Film Awards.