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- Lake effect (snow or ice weather phenomena)
- Lake Wobegon effect (cognitive biases) (psychological theories) (social psychology)
- Landau–Pomeranchuk–Migdal effect (high-energy physics)
- Larsen effect (audio feedback)
- Late effect (disease)
- Lawn dart effect (psychology)
- Lazarus effect (particle detectors)
- LCD memory effect (display technology)
- Lead–lag effect (control theory) (economics and finance)
- Leakage effect (tourism)
- Learning effect (economics) (economics) (economics terminology)
- Lee–Boot effect (biology) (reproduction)
- Legalized abortion and crime effect (abortion debate) (criminology)
- Leidenfrost effect (physical phenomena)
- Lenard effect (physics)
- Lense–Thirring effect (effects of gravitation) (tests of general relativity)
- Leveling effect (chemistry)
- Levels-of-processing effect (educational psychology) (psychology) (psychological theories)
- Liquid Sky (effect) (lasers) (stage lighting)
- Little–Parks effect (condensed matter physics)
- Lockin effect (physics)
- Lombard effect (phonetics) (human voice) (animal communication) (human communication) (noise pollution)
- Lotus effect (nanotechnology)
- Low-frequency effects (film sound production) (technology)
- Lubbert's effect (medicine) (radiography) (radiology)
- Lunar effect (moon myths) (pseudoscience)
- Luxemburg–Gorky effect (radio communication) (radio spectrum)
Read more about this topic: List Of Effects