Name  | active from | active to | |
| Iras | 1984 | 1995 |  |
| Irglova, Marketa | 2002 | | |
| Irish Dew | 1995 | | |
| Isabelle | 1987 | 1994 | |
| Isara | 2010 | | |
| Ivan Hlas Trio | | | |
| Ivaska, Jozef | | | |
| Ivo Preis Trio | | | |
| J. H. Krchovsky | 2007 | | |
| J. Kernasevicova & J. Zeleznak | | | |
| J.A.R. | 1989 | | |
| Jablkon | 1979 | | |
| Jackson, Wanda | 1956 | | |
| Jahelka, Ivo | 1978 | | |
| Jakabcic, Matus | | | |
| Jaksi Taksi | 1992 | | |
| Jakub Venzel | 1982 | 1986 | |
| Jamair | | | |
| Jamrich, Dusan | | | |
| Jan Burian & Jaroslav Koran | 2017 | | |
| Jan Burian Band | 2019 | | |
| Jan Korinek & Grooves | 2000 | | |
| Jan Spaleny Trio | | | |
| Janackova filharmonie Ostrava | | | |
| Jananas | 2005 | | |
| Janda Janda | 1988 | 1988 | |
| Janda, Dalibor | 1980 | | |
| Janda, Petr | 1959 | | |
| Jandova, Lada | | | |
| Jandova, Zora | | | |
