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- Jack-in-the-box effect (military) (military slang and jargon) (tanks)
- Jahn–Teller effect (condensed matter physics) (inorganic chemistry) (organometallic chemistry) (quantum chemistry)
- January effect (behavioral finance) (economics and finance) (market trends) (stock market)
- Janus effect (effects) (sociology)
- Johnsen–Rahbek effect (classical mechanics) (electrical engineering)
- Joule–Thomson effect (thermodynamics)
- Josephson effect (condensed matter physics) (sensors) (superconductivity)
- Jupiter effect (astronomy) (science book)
Read more about this topic: List Of Effects