- Kowalewski, Janusz1
- Kołakowski, Leszek1
- Krassó, György1
- Krupskaya, Nadezhda Konstantinovna1
- Kubelka, Peter1
- Kuusinen, Aino1
- Lenin, Vladimir Ilʹich1
- Leningradskaia Studiia Dokumentalnykh Filmov (LSDF)1
- Lennauchfilm1
- Lewytzkyj, Borys1
- Liebert, Wacław1
- Magos, Gábor1
- Magos-Gimes, Judit1
- Magyar Szocialista Munkáspárt1
- Makavejev, Dusan1
- Mandelʹshtam, Nadezhda1
- Marczewski, Jean1
- Matous̆, Milan1
- McNeal, Robert Hatch1
- Media and Opinion Research Department1