God Speed You! Black Emperor (ゴッド・スピード・ユー! BLACK EMPEROR) is a 1976 Japanese black-and-white 16 mm documentary film, 90 minutes long, by director Mitsuo Yanagimachi, which follows the exploits of a Japanese biker gang, the Black Emperors. 1970sJapan saw the rise of biker gangs, known as Bōsōzoku, which drew the interest of the media. The movie follows a member of the bike gang and his interaction with his parents, after he gets in trouble with the police.
The name of the Canadian orchestral post-rock band, Godspeed You! Black Emperor, is derived from the film's title.