| March 1955 | – | May 1957 | Franz-Wilhelm Heimer (Germany) |
| May 1957 | – | November 1958 | Theodor Hanf (Germany) |
| November 1958 | – | September 1959 | Jules Molitor (Luxembourg) |
| September 1959 | – | November 1959 | Eckhart Koch (Germany) |
| November 1959 | – | August 1961 | Janine Grand (France) |
| August 1961 | – | October 1962 | Herman Vanden Houte (Flanders, Belgium) |
| October 1962 | – | October 1964 | Elizabeth Crook (Great-Britain) |
| October 1964 | – | September 1965 | Rudolf Herrmann (Germany) |
| September 1965 | – | September 1966 | Maurice Walsh (Great-Britain) |
| September 1966 | – | October 1967 | Irmi Lang (Germany) |
| October 1967 | – | May 1968 | Jean-François Grandbastien (France) |
| May 1968 | – | November 1970 | Léonardo Aragón (France) |
| November 1970 | – | June 1971 | nobody |
| June 1971 | – | … 1971 | Jürgen Linden (Germany) |
| … 1971 | – | … 1973 | Michel Welter (Luxembourg) |
| … 1973 | – | … 1976 | Claudine Richard (Wallonia, Belgium) |
| (… | – | …) | (nobody ?) |
| January 1977 | – | November 1982 | Jan Dereymaeker (Flanders, Belgium) |
| November 1982 | – | September 1984 | Jo Uytendaele (Flanders, Belgium) |
| November 1982 | – | June 1986 | Tony Doherty (Great-Britain) |
| September 1983 | – | September 1985 | Jean-Claude Huot (Switzerland) |
| September 1984 | – | September 1987 | Marleen Deprins (Flanders, Belgium) |
| June 1986 | – | October 1990 | Jean-Philippe Restoueix (France) |
| June 1986 | – | October 1990 | Isabella Nespoli (Italy) |
| September 1987 | – | November 1989 | Gisela Grundges (Germany) |
| October 1990 | – | May 1992 | Véronique Oruba (Wallonia, Belgium) |
| March 1991 | – | October 1992 | Anna Chodorowska (Poland) |
| May 1992 | – | September 1995 | Maria Koutatzi (Greece) |
| October 1992 | – | September 1995 | Catalina Mas I Llull (Catalonia, Spain) |
| October 1995 | – | … | Miguel Angel (Spain) |
| October 1995 | – | … | Claudia Schachinger (Austria) |
| … 1998 | – | October 2001 | Luis Pinto (Portugal) |
| … 1998 | – | September 2002 | Anna Pallarès I Ribera (Catalonia, Spain) |
| … 2002 | – | October 2005 | Gediminas Pleckaitis (Lithuania) |
| November 2004 | – | January 2007 | Renato Oliveira (Portugal) |
| January 2007 | – | September 2008 | Julia Maria Koszewska (Poland) |
| September 2008 | – | September 2011 | Mihai Floran (Romania) |
| October 2011 | – | October 2014 | Johannes Maximilian Nießen (Germany) |
| November 2014 | – | December 2017 | Simon Christian Fischer (Germany) |
| January 2018 | – | October 2019 | Mariana Ribeiro de Sousa (Portugal) |
| November 2019 | – | December 2021 | Eirini Freri (Greece) |
| January 2022 | – | … | Anna Holtkamp (Germany) |