Sid Vicious, born John Simon Ritchie, later named John Beverley (10 May 1957 – 2 February 1979), was an English bass guitarist and vocalist, most famous as a member of the influential punk group the Sex Pistols.

Vicious joined the Sex Pistols in early 1977, to replace Glen Matlock, who had fallen out of favour with the rest of the group. Due to intravenous drug use, Vicious was hospitalized with hepatitis during the recording of the band's only studio album Never Mind the Bollocks. Accordingly, his bass is only partially featured on one song from the album. Vicious would later appear as a lead vocalist, performing three cover songs, on the soundtrack to The Great Rock 'n' Roll Swindle, a largely fictionalized documentary about the Sex Pistols, produced by the group's former manager Malcolm McLaren and directed by Julien Temple.