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- Wagon-wheel effect (optical illusion)
- Wahlund effect (evolution) (population genetics)
- Walkman effect (computing and society) (technology)
- Wallace effect (evolutionary biology) (speciation)
- Warburg effect (biochemistry) (oncology) (photosynthesis)
- Wealth effect (economics and finance) (wealth)
- Weapons effect (gun politics)
- Weathervane effect (aviation terminology)
- Weissenberg effect (physics)
- Wet floor effect (computer graphic techniques) (computer graphics) (Web 2.0)
- Whitten effect (menstruation)
- Wigner effect (condensed matter physics) (nuclear technology) (physical phenomena) (radiation effects)
- Wilson effect (astronomy) (Sun)
- Wilson–Bappu effect (physics)
- Wimbledon effect (economic theories) (economy of Japan) (economy of London)
- Windkessel effect (physiology)
- Withgott effect (linguistics) (phonetics)
- Wolf effect (scattering) (spectroscopy)
- Wolff–Chaikoff effect (iodine) (medicine)
- Woodward effect (spacecraft propulsion)
- Word superiority effect (cognitive science)
- Worse-than-average effect (cognitive biases) (psychological theories) (social psychology)
Read more about this topic: List Of Effects