The Deadly Breaking Sword is a 1979 Hong Kong wuxia film directed by Sun Chung and starring Ti Lung and Alexander Fu Sheng.

Warrior Tuan Changqing (Ti Lung) meets courtesan Liu Yinxi (Shih Szu) in a small town.

Liu pleads Tuan to kill underworld master Guo Tiansheng (Ku Feng), known as the "Killer Doctor", in order to avenge the death of her fiancé.

Tuan and casino security guard Xiao Dao (Alexander Fu Sheng) break into Guo's household and trigger the battle of good against evil.

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.