Heroic bloodshed is a genre of Hong Kong action cinema revolving around stylized action sequences and dramatic themes such as brotherhood, duty, honour, redemption and violence. The term heroic bloodshed was coined by editor Rick Baker in the magazine Eastern Heroes in the late 1980s, specifically referring to the styles of directors John Woo and Ringo Lam. Baker defined the genre as "a Hong Kong action film that features a lot of gun play and gangsters rather than kung fu. Lots of blood. Lots of action." Woo's film A Better Tomorrow is said to have popularized the genre. Woo has also been a major influence in its continued popularity and evolution in his later works, namely Hard Boiled, A Better Tomorrow 2, and The Killer.

Protagonists in these films are often good-willed criminals, typically Triad members, hit men, or thieves with a strict code of ethics, which in some cases lead to betrayal of their employer and savior to many of the intended victims, or police officers with a conscience, who cannot be corrupted in any way and usually modeled after the hardboiled detective. Loyalty, family and brotherhood are the most typical themes of the genre. Heroic bloodshed films generally have a strong emotional angle, not only between, but during action sequences.

John Woo Yu-Sen SBS (born 1 May 1946) is a Hong Kong film director, writer, and producer. Recognized for his stylised films of highly choreographed action sequences, Mexican standoffs, and use of slow-motion. Woo has directed several notable Hong Kong action films, among them, A Better Tomorrow, The Killer, Hard Boiled and Red Cliff. His Hollywood films include Hard Target, Broken Arrow, Face/Off and Mission: Impossible 2. He also created the comic series Seven Brothers, published by Virgin Comics. Woo was described by Dave Kehr in The Observer in 2002 as "arguably the most influential director making movies today". Woo cites his three favorite films as David Lean's Lawrence of Arabia, Akira Kurosawa's Seven Samurai and Jean-Pierre Melville's Le Samouraï.

Woo was born amidst the chaos of the Chinese Civil War in 1946. The Christian Woo family, faced with persecution during Mao Zedong's early anti-bourgeois purges after the communist revolution in China, fled to Hong Kong when he was five. Impoverished, the Woo family lived in the slums at Shek Kip Mei. His father was a teacher, though rendered unable to work by tuberculosis, and his mother was a manual laborer on construction sites. The family was rendered homeless by the big Shek Kip Mei fire of 1953. Charitable donations from disaster relief efforts enabled the family to relocate; however, violent crime had by then become commonplace in Hong Kong housing projects.