- Kropotkin, Petr Alekseevich, kniaz'1
- Krupskaia, Nadezhda Konstantinovna1
- Kull, Steven1
- Kvasnička, Ján1
- Laird, Roy D.1
- Latysh, M. V.1
- Leitenberg, Milton1
- Leonhard, Wolfgang1
- Levine, Irving R.1
- Levitin-Krasnov, A. E.1
- Lewin, Moshe1
- Linden, Carl A.1
- Lukes, Igor1
- Lázár, György1
- Makarov, L.1
- Marie, Jean-Jacques1
- Mathieson, R. S.1
- McCalla, Robert B.1
- McDowell, Bart1
- McRea, Barbara P.1