Rancid may refer to:

• Rancidification, the oxidation of fats, fatty acids, and edible oils
• Rancid (band), an American punk band, and their eponymous releases:
  • Rancid (EP), the above group's self-titled debut EP released in 1992
  • Rancid (1993 album), their first full-length album
  • Rancid (2000 album), second self-titled album
• Rancid (film), a 2004 Swedish film
• RANCID (software), network management software
• Rancid News, a punk zine also known as Last Hours