"Shock" is a song by American heavy metal band Fear Factory. It was the lead single from their 1998 album Obsolete and the first track on the album. Its music was composed by guitarist Dino Cazares and drummer Raymond Herrera. The lyrics were written by vocalist Burton C. Bell. The introduction of a concept album, "Shock" introduces its protagonist, a political prisoner known only as Edgecrusher, who declares his personal mission to destroy the totalitarian society in which he lives.

The song was featured in the TV series Angel from season 2 episode 10 "Reunion".

It peaked at No. 16 on the Billboard Mainstream Rock chart and No. 38 on Modern Rock Tracks.