Men Behind the Sun

Men Behind the Sun
Theatrical release poster
Chinese name
Traditional Chinese	黑太陽731
Simplified Chinese	黑太阳731
Literal meaning	Black Sun 731
Transcriptions Standard Mandarin Hanyu Pinyin hēi tàiyáng 731
Directed by	T. F. Mou
Written by	Mei Liu Wen Yuan Mou Dun Jing Teng
Produced by	Fu Chi Hung Chu
Starring	Gang Wang Hsu Gou Tie Long Jin Zhao Hua Mei Zhe Quan Run Sheng Wang Dai Wao Yu Andrew Yu
Production company	Sil-Metropole Organisation
Distributed by	Grand Essex Enterprises
Release date	1 December 1988 (1988-12-01)
Running time	105 minutes
Country	Hong Kong
Language	Mandarin Chinese
Box office	HK$11.1 million US$1.4 million

Men Behind the Sun (Chinese: 黑太陽731, literally Black Sun: 731, also sometimes called Man Behind the Sun) is a 1988 Hong Kong historical exploitation horror film directed by T. F. Mou, and written by Mei Liu, Wen Yuan Mou and Dun Jing Teng. The film is a graphic depiction of the war atrocities committed by the Imperial Japanese Army at Unit 731, the secret biological weapons experimentation unit of the Imperial Japanese Army during the Second Sino-Japanese War. It details the various cruel medical experiments Unit 731 conducted on Chinese and ethnic Russian prisoners towards the end of the war.

It is the first film to be classified "level III" (equivalent to the US rating NC-17) in Hong Kong.