| Observer Countries |
|  | |
| >>Republic of El Salvador |
| Incorporation | June 17th 1981 |
| | CR/Agreement 4 |
| | |
| >> Republic of Honduras |
| Incorporation | February 1st 1982 |
| | CR/Agreement 10 |
| | |
| >> Kingdom of Spain |
| Incorporation | November 30th 1982 |
| | CR/Agreement 18 |
| | |
| >> Portuguese Republic |
| Incorporation | July 27th 1983 |
| | CR/Agreement 20 |
| | |
| >> Republic of Guatemala |
| Incorporation | August 2nd 1984 |
| | CR/Agreement 31 |
| | |
| >> Dominican Republic |
| Incorporation | August 15th 1984 |
| | CR/Agreement 36 |
| | |
| >> Republic of Costa Rica |
| Incorporation | November 11th 1986 |
| | CR/Agreement 64 |
| | |
| >> Republic of Nicaragua |
| Incorporation | July 15th 1987 |
| | CR/Agreement 70 |
| | |
| >>Italian Republic |
| Incorporation | July 15th 1987 |
| | CR/Agreement 71 |
| | |
| >> Republic of Panama |
| Incorporation | December 3rd 1987 |
| | CR/Agreement 77 |
| | |
| >> Swiss Confederation |
| Incorporation | October 30th 1991 |
| | CR/Agreement 142 |
| | |
| >> Russian Federation |
| Incorporation | June 23rd 1993 |
| | CR/Agreement 157 |
| | |
| >> Republic of Romania |
| Incorporation | December 15th 1993 |
| | CR/Agreement 166 |
| | |
| >> People’s Republic of China |
| Incorporation | June 15th 1994 |
| | CR/Agreement 173 |
| | |
| >> República de Corea |
| Incorporation | June 16th 2004 |
| | CR/Agreement 247 |
| | |
| >> Japón |
| Incorporation | June 30th 2004 |
| | CR/Acuerdo 248 |
|
| >> Ucrania |
| Incorporation | February 2nd 2006 |
| | CR/Acuerdo 253 |
|
| Observing Organizations |
| | |
| | |
| >> Economic Commission for Latin America and the Caribbean (ECLAC) |
| Incorporation | June 17th 1981 |
| | CR/Agreement 2 |
| | |
| >>Organization of American States (OAS) |
| | |
| Incorporation | June 17th 1981 |
| | CR/Agreement 3 |
| | |
| >> Inter-American Development Bank (IDB) |
| Incorporation | February 1st 1982 |
| | CR/Agreement 11 |
| | |
| >> United Nations Development Programme (UNDP) |
| Incorporation | September 3rd 1986 |
| | CR/Agreement 60 |
| | |
| >> European Commission |
| Incorporation | July 6th 1990 |
| | CR/Agreement 118 |
| | |
| >> Latin American Economic System (SELA) |
| Incorporation | November 13th 1996 |
| | CR/Agreement 202 |
| | |
| >> Andean Development Corporation (CAF) |
| Incorporation | December 10th 1996 |
| | CR/Agreement 205 |
| | |
| >>Inter-American Institute for Cooperation in Agriculture (IICA) |
| Incorporation | October 8th 1997 |
| | CR/Agreement 214 |
|
| >> Pan American Health Organization (PAHO)/World Health Organization (WHO) |
| Incorporation | May 16th 2001 |
| | CR/Agreement 240 |
|
| >> Secretaría General Iberoamericana (SEGIB) |
| Incorporation | May 29th 2008 |
| | CR/Agreement 274 |