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| Directeur Général | Mandat | Pays |
| Michel Hansenne | 1989-1999 | Belgium |
| Francis Blanchard | 1974-1989 | France |
| C. Wilfred Jenks | 1970-1973 | UK |
| David A. Morse | 1948-1970 | US |
| Edward Phelan | 1941-1948 | Ireland |
| John G. Winant | 1939-1941 | US |
| Harold Butler | 1932-1938 | UK |
| Albert Thomas | 1919-1932 | France |