Name  | active from | active to | |
| Kmet, Pavel | | | |
| Knebl, Michal | | | |
| Knizak, Milan | 1960 | | |
| Knock Out | 1979 | 1987 | |
| KOA | 1998 | | |
| Kobra | | | |
| Kocab, Michael | | | |
| Kocabova Natalie | 2000 | | |
| Kocianova, Jana | 1968 | |  |
| Kocickova, Ester | | | |
| Kocko, Tomas | 1992 | | |
| Kohout plasi smrt | 1996 | | |
| Kokrment | 1979 | 1991 | |
| Kolar, Jan | 1980 | | |
| Kolektivni halucinace | 2007 | | |
| Kolenic, Vlado | 1977 | | |
| Kolinska, Zora | 1966 | 2002 | |
| Koller, David | 1980 | | |
| Kollerband | 2003 | | |
| Koma | 1989 | 1991 | |
| Komajota | 2006 | | |
| Kometa | | | |
| Komety | 1959 | 1977 | |
| Konaboj | 2002 | | |
| Konarik, Karol | 1969 | | |
| Koncinna | 2017 | | |
| Konec leta | | | |
| Konrad, Ondrej | | | |
| Kontrast | 1986 | 1990 | |
| Konvergencie Quartet | 2017 | 2018 | |
