- Kaz-Ostaszewicz, Kazimierz1
- Keldysh, Mstislav1
- Khreptovich-Buteneva, O. A.1
- Khrushchev, Nikita Sergeevich1
- Kibalchich, Nikolai1
- Konev, Ivan1
- Krivosheina, N. A.1
- Krzhizhanovskii, Gleb1
- Kulibin, Ivan1
- Kurdiumov, Georgii1
- Kuroń, Jacek,1
- Lablonskaia, Tatiana1
- Lebedev, Sergei1
- Legall, Alberto1
- Lenin1
- Likhachev, V. A.1
- Lomonosov, Mikhail1
- Lékai, László1
- Markov, Georgi1
- Marx, Karl1