- Levine, Isaac Don1
- Levitin-Krasnov, A. E.1
- Levitzky, Sergei Aleksandrovich1
- Liebert, Wacław1
- Liebknecht, Karl1
- Liebknecht, Karl Paul August Friedrich1
- Lisiecka, Alicja1
- Livy1
- Lobachevskii, Nikolai1
- Loebl, Eugen1
- Lomonosov, Mikhail1
- Lunev, Afanasii1
- Luxemburg, Rosa1
- Lévesque, René1
- Machrowicz, Thaddeus Michael1
- Maclean, Donald1
- Maloumian, Armand1
- Mancham, James1
- Marshall, George C.1
- Marx, Karl, 1818–18831