| 2007-2009 | Gunter H. Rütter |
| 2003-2007 | Bruno Pelletier |
| 1996-2003 | Walter Henny |
| 1993-1996 | Lasse Braathen |
| 1983-1993 | Marcel de Haan |
| 1979-1983 | André Pirard |
| 1967-1979 | René Mehl |
| 1964-1967 | Jean-Philippe Makkink |
| 1960-1964 | Col Schlumberger |
| 1948-1960 | Col Decharneux |
Past Secretary-Generals