Name  | active from | active to | |
| Kontrast | 1986 | 1990 |  |
| Konvergencie Quartet | 2017 | 2018 | |
| Konvoj | 1987 | 1989 | |
| Konvrzek, Jiri | 1980 | | |
| Kopecky, Milos | | | |
| Koprivreska | | | |
| Korjen | 2010 | | |
| Korn, Jiri | 1966 | | |
| Koran, Jaroslav | | | |
| Korinkova, Lenka | 1976 | 1992 | |
| Kostolanyiova, Eva | 1960 | 1975 | |
| Kotvald & Hlozek | 1980 | | |
| Kotzian, Pavel | 1983 | 2009 | |
| Koubek, Vaclav | | | |
| Koubkova, Jana | 1970 | | |
| Koudelova, Vlasta | | | |
| Kovarik, Miroslav | | | |
| Kovarik, Zdenek | | | |
| Kozelska, Zita | 1984 | | |
| Krabat | 1982 | 1984 | |
| Krabathor | 1988 | | |
| Krajanci | | | |
| Krajina Ro | 2020 | | |
| Krakatit | | | |
| Krakatit (CZ) | 1976 | | |
| Kral, Ivan | 1964 | | |
| Kralova, Marcela | 1973 | | |
| Krasne nove stroje | 1982 | | |
| Kratke spojeni | 1987 | 1988 | |
| Kratky Proces | 1987 | | |
