- Labor Day
- Lace
- Lacrosse
- Land use policies
- Land mines
- Landfills
- Landscape architecture
- Landslides
- Language
- Laser surgery
- Latex allergies
- Lava
- Lead poisoning
- Learning disabilities
- Leeches
- Libraries
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- Light therapy
- Lightning
- Limnology
- Linguistics
- Liposuction
- Liquor laws
- Listening
- Literacy
- Llamas
- Loch Ness monster
- Logging
- Low-income housing
- Lupus
- Lymphoma
- Lynching
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