Godspeed You! Black Emperor (sometimes abbreviated to GY!BE or Godspeed) is a Canadian post-rock band that originated in Montreal, Quebec in 1994. The group releases recordings through Constellation, an independent record label also located in Montreal.

The group released their debut album F♯ A♯ ∞, in 1997 and toured regularly from 1998 to 2003. Their second album Lift Your Skinny Fists Like Antennas to Heaven (2000) received critical acclaim and has been named as one of the best albums of the decade. Following the release of Yanqui U.X.O. (2002), the band went on hiatus in 2003 to pursue other musical interests.

The band was rumored to have broken up, but reformed in 2010. Their first post-reunion album Allelujah! Don't Bend! Ascend! (2012) won the 2013 Polaris Music Prize. This was followed by Asunder, Sweet and Other Distress (2015), Luciferian Towers (2017), G_d's Pee at State's End! (2021) and No Title as of 13 February 2024 28,340 Dead (2024).

The band has a dedicated cult following and is renowned for being influential in the post-rock genre. Their music, mainly instrumental in nature, has been noted for its contrasts between ambient soundscapes and chaotic crescendos; use of field recordings and spoken word monologues; and focus on dystopian, anarchist and anti-war themes. Members of the group have formed a number of side projects, including Thee Silver Mt. Zion Memorial Orchestra & Tra-La-La Band, Fly Pan Am, HṚṢṬA, Esmerine, and Set Fire to Flames.