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- Raman effect (physics)
- Ramp effect (drug addiction) (drug rehabilitation)
- Ramsauer–Townsend effect (physical phenomena) (scattering)
- Ransom note effect (typography)
- Rashomon effect (psychology)
- Ratchet effect (game theory)
- Rear projection effect (special effects)
- Rebound effect (medical sign)
- Rebound effect (conservation) (economics paradoxes) (energy) (energy conservation)
- Red-eye effect (science of photography)
- Relativistic Doppler effect (Doppler effects) (special relativity)
- Renner–Teller effect (molecular physics)
- Reverse Cerenkov effect (physics)
- Reverse short-channel effect (transistors)
- Ringelmann effect (social psychology)
- Ripple effect (education) (sociology)
- Robin Hood effect (income distribution) (Robin Hood) (socioeconomics) (taxation)
- Roe effect (abortion debate) (abortion in the United States)
- Rope trick effect (nuclear weapons)
- Rossiter–McLaughlin effect (Doppler effects) (extrasolar planets) (spectroscopy) (star systems)
- Rusty bolt effect (radio electronics)
Read more about this topic: List Of Effects