Crunch may refer to:

• Big Crunch, a hypothetical scenario for the ultimate fate of the universe
• Credit crunch, a sudden reduction in the general availability of loans or a sudden tightening of the requirement conditions
• Crunch (chocolate bar), a chocolate bar made of milk chocolate and crisped rice
• Crunch Fitness, a chain of over 300 franchised fitness clubs located in the United States, Canada and Australia
• Crunch (video games), a period in which video game developers take on significant, often uncompensated overtime
• Crunchiness, the sensation of muffled grinding of a foodstuff
• John Draper (born 1943; also "Crunch"), an American computer programmer and legendary former phone phreak