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Critical mass is the amount of fissile material needed to sustain nuclear fission.

Critical mass may also refer to:

Science and technology

• Critical mass (sociodynamics), a stage in social-system innovation
• Critical mass (software engineering), a stage in the product life cycle of software

Organizations and social gatherings

• Critical Mass (cycling), a form of direct action or celebratory gathering involving large groups of bicycle riders
• Critical Mass (pressure group), a UK political pressure group
• Critical Mass Energy Project, an anti-nuclear umbrella group founded by Ralph Nader
  • Critical Mass Journal, published in 1977 by the Critical Mass Energy Project
• Critical Mass, a co-working center sponsored by the New England Venture Capital Association
• Critical Mass, a robotics team of the Dwight-Englewood School in Englewood, New Jersey

Literature

• Critical Mass (book), a 2004 book by Philip Ball
• Critical Mass (2013 book), a 2013 novel by Sara Paretsky
• "Critical Mass" (Pohl and Kornbluth short story), a 1962 story by Frederik Pohl and Cyril M. Kornbluth
• "Critical Mass" (Arthur C. Clarke short story), a 1949 short story by Arthur C. Clarke
• Critical Masses: Opposition to Nuclear Power in California, 1958–1978, a 1998 book by Thomas Wellock
• Critical Mass, a 1990 seven-issue comic book anthology printed under Epic Comics's Shadowline Saga imprint
• Critical Mass a 2023 follow-up novel to Delta-v by Daniel Suarez

Film and television

• Critical Mass, a 1971 experimental short film from Hollis Frampton's Hapax Legomena cycle
• Critical Mass (anime), a subdivision of the video publisher and distributor Right Stuf Inc.
• Critical Mass (film), a 2000 film starring Treat Williams and Lori Loughlin
• "Critical Mass" (Stargate Atlantis), an episode of Stargate Atlantis

Gaming

• Duke Nukem: Critical Mass, a shooter game developed by Frontline Studios
• Critical Mass (1985 video game) or Power!, a computer game by Durell Software
• Critical Mass (1982 video game), an adventure game by Sirius Software
• Critical Mass, a set of collectible miniature game figures by HeroClix

Music

Bands

• Critical Mass (Canadian band), a Catholic rock band formed in 1997
• Critical Mass (Dutch band), a Dutch happy hardcore group

Albums and songs

• Critical Mass (Dave Holland album), 2006
• Critical Mass (Threshold album), 2002
• Critical Mass (Matthew Shipp album), 1995
• Critical Mass (Ra album), 2013
• "Critical Mass", a song by Aerosmith from Draw the Line
• "Critical Mass", a song by Nuclear Assault from Handle with Care
• "Critical Mass", a song by Chrome from Half Machine Lip Moves

• Disambiguation pages