Loeb
- Luri
- Loeb , Jacques
- Loewi
- Loewi , Otto
- Löffler , Friedrich August Johannes
- Lomonosov , Mikhail Vasilievich
- London , Fritz
- London , Heinz
- Long , Crawford Williamson
- Lonsdale , Dame Kathleen
- Lorentz
- Lorentz , Hendrik Antoon
- Lorentz, Hendrik
- Lorenz
- Lorenz , Edward Norton
- Lorenz , Konrad Zacharias
- Loschmidt , Johann Josef
- Love , Augustus Edward Hough
- Lovell
- Lovell , Sir (Alfred Charles) Bernard
- Lovelock , James Ephraim
- Lowell , Percival
- Lowry , Thomas Martin
- Lowry, Thomas Martin
- Lucas , Keith
- Lummer , Otto
- Lundmark , Knut