Lewi - Lodg
- Lewis
- Lewis , Edward B.
- Lewis , Gilbert Newton
- Libby
- Libby , Willard Frank
- Libby's
- Lie , (Marius) Sophus
- Liebig , Justus von
- Lin , Chia-Chiao
- Lindblad , Bertil
- Linde , Karl von
- Lindemann , Carl Louis Ferdinand von
- Linnaeus
- Linnaeus , Carolus
- Lipmann
- Lipmann , Fritz Albert
- Lippershey , Hans
- Lippershey, Hans
- Lippmann , Gabriel
- Lipscomb , William Nunn
- Lissajous , Jules Antoine
- Lister , Joseph, Baron
- Littlewood , John Edensor
- Lobachevsky
- Lobachevsky , Nikolai Ivanovich
- Lockyer , Sir Joseph Norman
