Name  | active from | active to | |
| Marsyas | 1973 | |  |
| Marsalkova, Helena | 1970 | | |
| Martha a Tena Elefteriadu | 1968 | | |
| Martin, Milan | 1960 | | |
| Martincova Elena | 1984 | 1986 | |
| Martinova, Eva | 1956 | | |
| Martinova, Vera | 1978 | | |
| Marton, Rony | 1971 | 1985 | |
| Mashy Muxx | 1993 | | |
| Master's Hammer | 1987 | | |
| Matadors | 1965 | 1970 | |
| Matkovia | 1982 | 1986 | |
| Matuska, Waldemar | 1954 | 2009 | |
| Matyas Gali | | | |
| Matysova, Jana | 1971 | | |
| Maxa, Martin | | | |
| Mayer, Jaromir | 1964 | | |
| Mazikova, Eva | | | |
| Meat-House Chicago I.R.A. | 1990 | 1998 | |
| Medvecka-Pavlata | | | |
| Medved 009 | 1994 | | |
| Medzinarodna konklava | 1981 | 1981 | |
| Medzinarodne zoskupenie | 1988 | 1988 | |
| Mefisto | 1963 | 2007 | |
| Mechanicky pomeranc | | | |
| Melen, Josef | 1983 | | |
| Melouni | 2002 | | |
| Mercedes | | | |
| Merlin | 1988 | | |
| Merta, Vladimir | 1965 | | |
