- Johnson, Joseph E.1
- Jones, David R.1
- Juhász, Gyula1
- Juhász, Vilmos1
- Kabanov, Viacheslav Trofimovich1
- Kaniowski, Michał1
- Karlowich, Robert A.1
- Karpovich, Michael1
- Kasinec, E.1
- Katel, Jacques1
- Katz, Mark N.1
- Kaufman, Michael T.1
- Kende, Péter1
- Kent, Alexander1
- Kerensky, Aleksandr Fyodorovich1
- Kern, Eberhard Günther1
- Kevill, Siân1
- Khlevniuk, O. V.1
- Khromov, S. S.1
- Khvostov, Vladimir Mikhailovich1