"Let There Be Rock" is a song by Australian hard rock band AC/DC. It is the third and title track of their album Let There Be Rock, released in March 1977, and was written by Angus Young, Malcolm Young, and Bon Scott.

It was also released as a single, with a B-side of "Problem Child", in 1977.

The song provides an encapsulated, fictionalised version of the history of rock 'n' roll. Building on a line from the Chuck Berry song "Roll Over Beethoven": "... tell Tchaikovsky the news", "Let There Be Rock" reveals that Tchaikovsky did in fact receive the message and subsequently shared it with the masses, resulting in the rise of rock 'n' roll.

Following rock's birth, rock bands appeared everywhere, musicians found fame (while businesses made money off their efforts), and millions of people learned how to play electric guitar. The third and final verse speaks of a "42-decibel" rock band playing good, loud music in an establishment called "The Shaking Hand". This is usually changed to "92-decibel" in live versions of the song. After the final verse, the song ends with an extended solo by Angus Young, which consists mainly of fast picking, string bends, and hammer-ons.

Being one of AC/DC's most popular songs, "Let There Be Rock" has been included on four of the band's six official live albums: If You Want Blood You've Got It (sung by Bon Scott, 1978), Live: 2 CD Collector's Edition (sung by Scott's replacement Brian Johnson, 1992), Let There Be Rock: The Movie (Scott, 1979), released in 1997 as part of the Bonfire box set, Stiff Upper Lip Tour Edition (Johnson, 2001), recorded from Plaza De Toros in Madrid from 1996, and Live At River Plate (Johnson, 2012), with the last recorded during AC/DC's Black Ice World Tour at River Plate Stadium in Buenos Aires on 4 December 2009.

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