| Chef de misssion | Titre | Carrière | Nomination | Présentation des lettres de créance | Fin de l'affectation |
| Kelly, John Hall | H-C | NC | 1939/12/28 | 1940/03/09 | 1941/03/09 |
| Kearney, John Doherty | H-C | NC | 1941/07/31 | 1941/08/26 | |
| Mahoney, Merchant M. | H-C | C | 1945/11/19 | | 1946/05/04 |
| Garland, Edward Joseph | H-C p.i. | NC | 1946/05/04 | | 1947/03/19 |
| Turgeon, Hon. William Ferdinand Alphonse | H-C | NC | 1946/10/24 | 1947/03/19 | 1949/06/31 |
| Johnson, David Moffat | Chargé d'affaires a.i. | C | 1949/07/17 | | 1949/12/00 |
| Turgeon, Hon. William Ferdinand Alphonse | AEP | NC | 1950/01/23 | 1950/07/17 | 1955/04/20 |
| Chapdelaine, Joseph Marc Antoine Jean | Chargé d'affaires a.i. | C | 1950/01/23 | | 1950/07/17 |
| Rive, Alfred | AEP | C | 1955/08/16 | | 1963/07/07 |
| McLane, Paul Vernon | Chargé d'affaires a.i. | C | 1963/07/07 | | 1965/03/29 |
| Gill, Evan William Thistle | AEP | C | 1964/11/06 | 1965/03/29 | 1968/03/22 |
| McCardle, James Joachim | AEP | C | 1968/10/08 | 1969/01/16 | |
| Maddick, Harold Morton | AEP | C | 1972/05/25 | 1972/10/17 | 1976/08/31 |
| Ritchie, Albert Edgar | AEP | C | 1976/06/29 | 1976/10/27 | 1980/11/07 |
| Sullivan, Alan William | AEP | C | 1981/02/12 | | |
| Benson, Hon. Edgar J. | AEP | NC | 1982/09/03 | 1982/11/25 | |
| Rezek, Gustav Gad | Chargé d'affaires a.i. | C | 1985 | | 1986/05/12 |
| McDermott, Dennis | AEP | NC | 1986/01/28 | 1986/05/15 | 1989/05/24 |
| Wadsworth, Michael A. | AEP | NC | 1989/08/24 | 1989/10/17 | 1994/10/22 |
| Mawhinney, Barry Michael | AEP | C | 1994/07/12 | 1994/11/04 | 1996/10/04 |
| Phillips, Michael B. | AEP | C | 1996/09/24 | 1996/11/05 | 1998/09/11 |
| Irwin, Ronald A. | AEP | NC | 1998/09/04 | 1998/09/24 | |
| Gusen, William | Chargé d'affaires a.i. | C | 2001/10/10 | | 2002/08/01 |
| Moher, Mark | AEP | C | 2002/07/02 | 2002/09/10 | 2006/08/08 |
| Westdal, Christopher William | AEP | C | 2006/09/20 | 2006/10/24 | 2006/12/07 |
| Schwenger, Carl | Chargé d'affaires a.i. | C | 2006/12/07 | | |
| Binns, Patrick | AEP | NC | 2007/08/13 | 2007/10/02 | 2010/09/03 |
| Hearn, Loyola | AEP | NC | 2010/11/17 | 2011/01/12 | 2014/08/26 |
| Vickers, Kevin | AEP | NC | 2015/01/19 | 2015/01/21 | 2019/03/02 |
| Smyth, Nancy | AEP | C | 2021/03/23 | 2021/06/17 | |