L1
- 1L (disambiguation)
- ATC code L01
- Anthranilic acid
- Arado L 1
- Barcelona Metro line 1
- Bose L1 Portable Systems
- CPU cache
- Caenorhabditis elegans
- DSC-L1
- Danjon scale
- Erie L-1
- GCR Class 1B
- GNR Class L1
- GPS
- GPS
- HMS L1
- Haplogroup L1 (mtDNA)
- ISO/IEC 8859-1
- L-1 Identity Solutions
- L-1 visa
- L-carrier
- L1 (New York City bus)
- L1 (broadcaster)
- L1 (protein)
- L1 Dulwich Hill Line
- L1 family
- L1A1 Self-Loading Rifle
- LINE1
- LNER Thompson Class L1
- Lasso (statistics)
- Lawrance J-1
- Lehrgeschwader 1
- Level 1 (disambiguation)
- Ligue 1
- Limburg (Netherlands)
- List of North American broadcast station classes
- Liverpool
- Lowest unique bid
- Lp space
- Lucifer (2019 Indian film)
- Lufthansa Systems
- Luxo
- Léman Express
- Macchi L.1
- Netherlands
- Panasonic Lumix DMC-L1
- Pennsylvania Railroad class L1s
- SR L1 class
- Sony Xperia L1
- Soo Line L-1 class
- Soyuz 7K-L1
- Stinson L-1 Vigilant
- USS L-1 (SS-40)
- VR Class Vr1
- Volkswagen L1
- ℓp space