The Deadly Breaking Sword () is a 1979 Hong Kong wuxia film directed by Sun Chung, starring Ti Lung and Alexander Fu. In the film, a courtesan convinces a warrior to kill a crime lord for her. The warrior proceeds with breaking and entering into his target's household.
Duan Changqing, a warrior, meets Liu Yinxu, a courtesan, in a small town. She pleads with him to help her avenge her brother by killing Guo Tiansheng, a notorious crime lord. Duan allies with Gao Men, a bouncer, to break into the Guo residence and eliminate the crime lord.
The theme song "True Colors of a Beautiful Hero" () was composed by Joseph Koo with the lyrics by Sun Yi, and sung by Jenny Tseng in Cantonese.
Ian Jane of DVD Talk gave the film a positive review and writes "The film might seem a little dated considering that it came out in the mid-eighties, past the genre's prime by a bit of a margin, but it stands as a good example of how fun and exciting a well made Shaw Brothers swordplay could be when delivered by a dedicated director and a talented cast."
The film grossed HK$2,716,494 at the Hong Kong box office during its theatrical run from 12 to 26 April 1979 in Hong Kong.