- Kommunisticheskaia partiia Sovetskogo Soiuza1
- Krivitsky, W. G.1
- Kropotkin, Petr Alekseevich1
- Kuleshov, Lev1
- Lemberg, Alexander1
- Lenin, Vladimir Ilʹich1
- Levkoyev, Grigori1
- Liberman, Matviei Nikolaevich1
- Lifar, Serge1
- Littlepage, John D.1
- Lorentz, Pare1
- Losskii, Nikolai Onufrievich1
- Ludecke, Kurt Georg Wilhelm1
- Ludendorff, Erich1
- Lévy-Ullmann, Henri1
- Macpherson, Kenneth1
- Magos-Gimes, Judit1
- Marx, Karl1
- Medvedkin, Alexander1
- Mehring, Franz1