"Number One Fist in the World"), also known as Five Fingers of Death, is a 1972 Hong Kong martial arts film directed by Chung Chang-Wha (Korean: 정창화; Hanja: 鄭昌和) and starring Lo Lieh.

It was produced by Shaw Brothers (HK) Ltd. (Chinese: 邵氏兄弟（香港）公司), the largest Hong Kong movie production studio at the time.

Made in Hong Kong, it is one of many kung fu movies with Indonesian-born actor Lo Lieh (羅烈) in the lead.

He appeared in many similar martial arts film efforts from the 1960s, pre-dating the more internationally successful Bruce Lee.

He instructs Chi-Hao to learn from Chin-Pei and defeat the local martial arts tyrant, Ming Dung-Shun, in an upcoming tournament in order to earn Yin-Yin's hand.

Chi-Hao meets a young female singer, Yen Chu Hung, on the road to the city and rescues her from Dung-Shun's thugs.

On the day of the tournament, a conscience-stricken Chen Lang warns Chi-Hao of the three Japanese thugs lying in ambush on the road to the arena.

[3] When the film was released in director Chung Chang-Wha's native South Korea, it was re-titled The Iron Man.

The distributor Shina Sang-ok sold the film falsely as a South Korean co-production to avoid paying import taxes.

And the karate in 'Five Fingers of Death,' for all its slow-motion high leaps, its grunts, its whooshing fists, has the look of the bottom of the barrel.

"[9] Variety called it "a Chinese actioner glossed with all the explosive trappings that make for a hit in its intended market ... Exquisitely-filmed and packed with colorful production values, direction by Cheng Chang Ho is powerful and direct and he gets top performances from cast headed by Lo Lieh, as the student, and Wang Ping as his beloved.

"[10] Gene Siskel of the Chicago Tribune gave the film 2 stars out of 4 and called it "a shoddy, poorly dubbed melodrama stuffed with insane dialog," though he acknowledged "the genuine excitement generated by the fight sequences, providing you can get excited at the sight of a karate chop that splits a forehead.

"[11] Fredric Milstein wrote in the Los Angeles Times, "Director Chen Chang Ho, who has a definite sense of style, keeps the pace fast and the action spectacular ... Dubbing is awful, but you don't come to this one to hear people talk.