Name  | active from | active to | |
| Joe Carnation Band | | | |
| John Dovanni | 1990 | 1995 |  |
| John McLaughlin Duo | | | |
| Johnova, Marketa | 1970 | 2000 | |
| Jolly Joker and The Plastic Beatles of the Univers | 1991 | | |
| Jonas, Gabriel | | | |
| Jonika Quintet | | | |
| Jordak, Frantisek | | | |
| Joy | | | |
| Juanita Juarez | 2001 | | |
| Jugend | | | |
| Jukkis Uotila Band | | | |
| Julia | | | |
| Julo Kazimir & Olo Lachky | 1979 | | |
| Junas, Daniel | 1980 | | |
| Junas, Dano | 1978 | | |
| Junior | 1970 | 1976 | |
| Junior Trio | 1961 | 1965 | |
| Juventus | 1962 | 1969 | |
| Juza - Pavlovsky | | | |
| Kabat | 1983 | | |
| Kafka Band | 2013 | | |
| Kahovcova, Vlasta | 1966 | | |
| Kahovec. Karel | | | |
| Kalandra, Petr | 1963 | 1995 | |
| Kale | | | |
| Kalle | | | |
| Kalmanova, Ingrid | 1982 | | |
| Kalousek, Jan | 1980 | | |
| Kamberska, Karolina | 1999 | | |
